N-hydroxyamidinoheterocycles as modulators of indoleamine 2,3-dioxygenase

1. A method of inhibiting immunosuppression or treating a cancer selected from melanoma, ovarian cancer, and breast cancer, in a patient comprising administering to said patient an effective amount of a compound of Formula Ia:

or a pharmaceutically acceptable salt thereof, wherein:

U is N;

V is O;

W is N, wherein the five-membered ring containing U, V, and W is an aromatic heterocycle;

A is aryl, or heteroaryl, each optionally substituted by 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, Cy 1 , CN, NO 2 , OR a , SR a , C(O)R b , C(O)NR c R d , C(O)OR a , OC(O)R b , OC(O)NR c R d , NR c R d , NR c C(O)R b , NR c C(O)NR c R d , NR c C(O)OR a , C(═NR i )NR c R d , NR c C(═NR i )NR c R d , P(R f ) 2 , P(OR e ) 2 , P(O)R e R f , P(O)OR e OR f , S(O)R b , S(O)NR c R d , S(O) 2 R b , NR c S(O) 2 R b , and S(O) 2 NR c R d , wherein said C 1-6 alkyl, C 2-6 alkenyl, and C 2-6 alkynyl is optionally substituted with 1, 2, or 3 substitutents independently selected from Cy 1 , CN, NO 2 , OR a , SR a , C(O)R b , C(O)NR c R d , C(O)OR a , OC(O)R b , OC(O)NR c R d , NR c R d , NR c C(O)R b , NR c C(O)NR c R d , NR c C(O)OR a , C(═NR i )NR c R d , NR c C(═NR i )NR c R d , P(R f ) 2 , P(OR e ) 2 , P(O)R e R f , P(O)OR e OR f , S(O)R b , S(O)NR c R d , S(O) 2 R b , NR c S(O) 2 R b , and S(O) 2 NR c R d ;

R is H;

R A and R B are each H;

Q is OR Q , OC(O)R Q , OC(O)NR 4 R Q , NR 4 R Q , NR 4 C(O)R Q , NR 4 C(O)NR 4 R Q , NR 4 C(O)OR Q , NR 4 S(O)R Q , NR 4 S(O) 2 R Q , NR 4 C(═NR i )NR 4 R Q , SR Q , S(O)R Q , S(O)NR 4 R Q , S(O) 2 R Q , S(O) 2 NR 4 R Q , C(O)R Q , C(O)OR Q , C(O)NR 4 R Q , halo, cyano, azido, or nitro;

R Q is H, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocycloalkylalkyl, wherein said C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocycloalkylalkyl is optionally substituted by 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, halosulfanyl, Cy, —(C 1-4 alkyl)-Cy, CN, NO 2 , OR a2 , SR a2 , C(O)R b2 , C(O)NR c2 R d2 , C(O)OR a2 , OC(O)R b2 , OC(O)NR c2 R d2 , NR c2 R d2 , NR c2 C(O)R b2 , NR c2 C(O)NR c2 R d2 , NR c2 C(O)OR a2 , C(═NR i )NR c2 R d2 , NR c2 C(═NR i )NR c2 R d2 , P(R f2 ) 2 , P(OR e2 ) 2 , P(O)R e2 R f2 , P(O)OR e2 OR f2 , S(O)R b2 , S(O)NR c2 R d2 , S(O) 2 R b2 , NR c2 S(O) 2 R b2 , and S(O) 2 NR c2 R d2 ;

or R 4 and R Q together with the N atom to which they are attached form a 4-20 membered heterocycloalkyl group or 5-20 membered heteroaryl group, each optionally substituted by 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, halosulfanyl, Cy, —(C 1-4 alkyl)-Cy, CN, NO 2 , OR a2 , —(C 1-4 alkyl)-OR a2 , SR a2 , —(C 1-4 alkyl)-SR a2 , C(O)R b2 , —(C 1-4 alkyl)-C(O)R b2 , C(O)NR c2 R d2 , —(C 1-4 alkyl)-C(O)NR c2 R d2 , C(O)OR a2 , —(C 1-4 alkyl)-C(O)OR a2 , OC(O)R b2 , —(C 1-4 alkyl)-OC(O)R b2 , OC(O)NR c2 R d2 , —(C 1-4 alkyl)-OC(O)NR c2 R d2 , NR c2 R d2 , —(C 1-4 alkyl)-NR c2 R d2 , NR c2 C(O)R b2 , —(C 1-4 alkyl)-NR c2 C(O)R b2 , NR c2 C(O)NR c2 R d2 , —(C 1-4 alkyl)-NR c2 C(O)NR c2 R d2 , NR c2 C(O)OR a2 , —(C 1-4 alkyl)-NR c2 C(O)OR a2 , C(═NR i )NR c2 R d2 , NR c2 C(═NR i )NR c2 R d2 , P(R f2 ) 2 , P(OR e2 ) 2 , P(O)R e2 R f2 , P(O)OR e2 OR f2 , S(O)R b2 , —(C 1-4 alkyl)-S(O)R b2 , S(O)NR c2 R d2 , —(C 1-4 alkyl)-S(O)NR c2 R d2 , S(O) 2 R b2 , —(C 1-4 alkyl)-S(O) 2 R b2 , NR c2 S(O) 2 R b2 , —(C 1-4 alkyl)-NR c2 S(O) 2 R b2 , S(O) 2 NR c2 R d2 , and —(C 1-4 alkyl)-S(O) 2 NR c2 R d2 ;

Cy, Cy 1 , and Cy 2 are independently selected from aryl, heteroaryl, cycloalkyl, and heterocycloalkyl, each optionally substituted by 1, 2, 3, 4 or 5 substituents independently selected from halo, C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, C 1-4 haloalkyl, halosulfanyl, CN, NO 2 , OR a3 , SR a3 , C(O)R b3 , C(O)NR c3 R d3 , C(O)OR a3 , OC(O)R b3 , OC(O)NR c3 R d3 , NR c3 R d3 , NR c3 C(O)R b3 , NR c3 C(O)OR a3 , C(═NR i )NR c3 R d3 , NR c3 C(═NR i )NR c3 R d3 , P(R f3 ) 2 , P(OR e3 ) 2 , P(O)R e3 R f3 , P(O)OR e3 OR f3 , S(O)R b3 , S(O)NR c3 R d3 , S(O) 2 R b3 , and S(O) 2 NR c3 R d3 ;

R 1 is H or C 1-4 alkyl;

R 4 is H, C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, C(O)—R 4a , SO 2 —R 4a , aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocycloalkylalkyl, wherein said C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocycloalkylalkyl is optionally substituted by 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, halosulfanyl, CN, NO 2 , OR a4 , SR a4 , C(O)R b4 , C(O)NR c4 R d4 , C(O)OR a4 , OC(O)R b4 , OC(O)NR c4 R d4 , NR c4 R d4 , NR c4 C(O)R b4 , NR c4 C(O)NR c4 R d4 , NR c4 C(O)OR a4 , C(═NR i )NR c4 R d4 , NR c4 C(═NR i )NR c4 R d4 , P(R f4 ) 2 , P(OR e4 ) 2 , P(O)R e4 R f4 , P(O)OR e4 OR f4 , S(O)R b4 , S(O)NR c4 R d4 , S(O) 2 R b4 , NR c4 S(O) 2 R b4 , and S(O) 2 NR c4 R d4 ;

R 4a is H, C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, or heterocycloalkylalkyl;

R a , R a3 , R a4 , and R a5 are independently selected from H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkylalkyl, wherein said C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl or heterocycloalkylalkyl is optionally substituted with OH, amino, halo, C 1-6 alkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, or heterocycloalkyl;

R b , R b3 , R b4 , and R b5 are independently selected from H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkylalkyl, wherein said C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, or heterocycloalkylalkyl is optionally substituted with OH, amino, halo, C 1-6 alkyl, C 1-6 haloalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, or heterocycloalkyl;

R a2 is H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, Cy 2 , or Cy 2 -(C 1-6 alkyl)-, wherein said C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, or C 2-6 alkynyl, is optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, halosulfanyl, Cy 2 , CN, NO 2 , OR a5 , SR a5 , C(O)R b5 , C(O)NR c5 R d5 , C(O)OR a5 , OC(O)R b5 , OC(O)NR c5 R d5 , NR c5 R d5 , NR c5 C(O)R b5 , NR c5 C(O)NR c5 R d5 , NR c5 C(O)OR a5 , C(═NR i )NR c5 R d5 , NR c5 C(═NR i )NR c5 R d5 , P(R f5 ) 2 , P(OR e5 ) 2 , P(O)R e5 R f5 , P(O)OR e5 OR f5 , S(O)R b5 , S(O)NR c5 R d5 , R b2 , S(O) 2 R b5 , NR c5 S(O) 2 R b5 , and S(O) 2 NR c5 R d5 ;

R b2 is H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, Cy 2 , or Cy 2 -(C 1-6 alkyl)-, wherein said C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, or aryl is optionally substituted with 1,2, 3,4, or 5 substituents independently selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, halosulfanyl, Cy 2 , CN, NO 2 , OR a5 , SR a5 , C(O)R b5 , C(O)NR c5 R d5 , C(O)OR a5 , OC(O)R b5 , OC(O)NR c5 R d5 , NR c5 R d5 , NR c5 C(O)R b5 , NR c5 C(O)NR c c5 R d5 , NR c5 C(O)OR a5 , C(═NR i )NR c5 R d5 , NR c5 C(═NR i )NR c5 R d5 , P(R f5 ) 2 , P(OR e5 ) 2 , P(O)R e5 R f5 , P(O)OR e5 OR f5 , S(O)R b5 , S(O)NR c5 R d5 , S(O) 2 R b5 , NR c5 S(O) 2 R b5 , and S(O) 2 NR c5 R d5 ;

R c and R d are independently selected from H, C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkylalkyl, wherein said C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, or heterocycloalkylalkyl is optionally substituted with OH, amino, halo, C 1-6 alkyl, C 1-6 haloalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, or heterocycloalkyl;

or R c and R d together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;

R c2 and R d2 are independently selected from H, C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, Cy 2 and Cy 2 -(C 1-6 alkyl)-, wherein said C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, and C 2-6 alkynyl, is optionally substituted with 1, 2, or 3, substitutents independently selected from halo, C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, C 1-4 haloalkyl, halosulfanyl, CN, NO 2 , OR a3 , SR a3 , C(O)R b3 , C(O)NR c 3 R d3 , C(O)OR a3 , OC(O)R b3 , OC(O)NR c3 R d3 , NR c3 R d3 , NR c3 C(O)R b3 , NR c3 C(O)OR a3 , C(═NR i )NR c3 R d3 , NR c3 C(═NR i )NR c3 R d3 , P(R f3 ) 2 , P(OR e3 ) 2 , P(O)R e3 R f3 , P(O)OR e3 OR f3 , S(O)R b3 , S(O)NR c3 R d3 , S(O) 2 R b3 , and S(O) 2 NR c3 R d3 ;

or R c2 and R d2 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group optionally substituted with 1, 2, or 3, substitutents independently selected from Cy 2 , Cy 2 -(C 1-6 alkyl)-, halo, C 1-4 alkyl, C 2-4 alkenyl, C 2-4 alkynyl, C 1-4 haloalkyl, halosulfanyl, CN, NO 2 , OR a3 , SR a3 , C(O)R b3 , C(O)NR c3 R d3 , C(O)OR a3 , OC(O)R b3 , OC(O)NR c3 R d3 , NR c3 R d3 , NR c3 C(O)R b3 , NR c3 C(O)OR a3 , C(═NR i )NR c3 R d3 , NR c3 C(═NR i )NR c3 R d3 , P(R f3 ) 2 , P(OR e3 ) 2 , P(O)R e3 R f3 , P(O)OR e3 OR f3 , S(O)R b3 , S(O)NR c3 R d3 , S(O) 2 R b3 , and S(O) 2 NR c3 R d3 ;

R c3 and R d3 are independently selected from H, C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkylalkyl, wherein said C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, or heterocycloalkylalkyl is optionally substituted with OH, amino, halo, C 1-6 alkyl, C 1-6 haloalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, or heterocycloalkyl;

or R c3 and R d3 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;

R c4 and R d4 are independently selected from H, C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkylalkyl, wherein said C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkylalkyl is optionally substituted with OH, amino, halo, C 1-6 alkyl, C 1-6 haloalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, or heterocycloalkyl;

or R c4 and R d4 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;

R c5 and R d5 are independently selected from H, C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, and heterocycloalkylalkyl, wherein said C 1-10 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, heteroaryl, cycloalkyl, heterocycloalkyl, arylalkyl, heteroarylalkyl, cycloalkylalkyl, or heterocycloalkylalkyl is optionally substituted with OH, amino, halo, C 1-6 alkyl, C 1-6 haloalkyl, aryl, arylalkyl, heteroaryl, heteroarylalkyl, cycloalkyl, or heterocycloalkyl;

or R c5 and R d5 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;

R e , R e2 , R e3 , R e4 , and R e5 are independently selected from H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, (C 1-6 alkoxy)-C 1-6 alkyl, C 2-6 alkynyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, and heterocycloalkylalkyl;

R f , R f2 , R f3 , R f4 , and R f5 are independently selected from H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, heteroaryl, and heterocycloalkyl;

R i is H, CN, C(O)NH 2 , or NO 2 ; and

p is 1, 2, 3, 4, 5.

2. The method of claim 1 , wherein A is phenyl optionally substituted by 1, 2, 3, 4, or 5 substituents selected from halo, C 1-6 alkyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, CN, NO 2 , OR a , SR a , C(O)R b , C(O)NR c R d , C(O)OR a , OC(O)R b , OC(O)NR c R d , NR c R d , NR c C(O)R b , NR c C(O)NR c R d , NR c C(O)OR a , S(O)R b , S(O)NR c R d , S(O) 2 R b , NR c S(O) 2 R b , and S(O) 2 NR c R d .

3. The method of claim 1 , wherein A is phenyl optionally substituted by 1, 2, 3, 4, or 5 substituents selected from halo, C 1-6 alkyl, and C 1-6 haloalkyl.

4. The method of claim 1 , wherein Q is OR Q .

5. The method of claim 1 , wherein Q is NR 4 R Q .

6. The method of claim 1 , wherein R Q is C 1-6 alkyl optionally substituted by 1, 2, 3, 4, or 5 substituents selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, Cy, —(C 1-4 alkyl)-Cy, CN, NO 2 , OR a2 , SR a2 , C(O)R b2 , C(O)NR c2 R d2 , C(O)OR a2 , OC(O)R b2 , OC(O)NR c2 R d2 , NR c2 R d2 , NR c2 C(O)R b2 , NR c2 C(O)NR c2 R d2 , NR c2 C(O)OR a2 , C(═NR i )NR c2 R d2 , NR c2 C(═NR i )NR c2 R d2 , P(R f2 ) 2 , P(OR e2 ) 2 , P(O)R e2 R f2 , P(O)OR e2 OR f2 , S(O)R b2 , S(O)NR c2 R d2 , S(O) 2 R b2 , NR c2 S(O) 2 R b2 , and S(O) 2 NR c2 R d2 .

7. The method of claim 1 , wherein R Q is aryl, heteroaryl, arylalkyl, or heteroarylalkyl, each optionally substituted by 1, 2, 3, 4, or 5 substituents selected from halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 haloalkyl, C 1-6 hydroxyalkyl, C 1-6 cyanoalkyl, Cy, —(C 1-4 alkyl)-Cy, CN, NO 2 , OR a2 , SR a2 , C(O)R b2 , C(O)NR c2 R d2 , C(O)OR a2 , OC(O)R b2 , OC(O)NR c2 R d2 , NR c2 R d2 , NR c2 C(O)R b2 , NR c2 C(O)NR c2 R d2 , NR c2 C(O)OR a2 , C(═NR i )NR c2 R d2 , NR c2 C(═NR i )NR c2 R d2 , P(R f2 ) 2 , P(OR e2 ) 2 , P(O)R e2 R f2 , P(O)OR e2 OR f2 , S(O)R b2 , S(O)NR c2 R d2 , S(O) 2 R b2 , NR c2 S(O) 2 R b2 , and S(O) 2 NR c2 R d2 .

8. The method of claim 1 , wherein R 4 is H.

9. The method of claim 1 , wherein R 1 is H.

10. The method of claim 1 , wherein the compound is a compound having Formula II:

or pharmaceutically acceptable salt thereof.

11. The method of claim 1 , wherein the compound is selected from:

N-(3-chloro-4-fluoro-phenyl)-N′-hydroxy-4-hydroxymethyl-furazan-3-carboxamidine;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(phenoxymethyl)-1,2,5-oxadiazole-3-carboximidamide;

4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-ylmethyl phenylcarbamate;

4-[(benzylamino)methyl]-N-(3-chloro-4-fluorophenyl)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[(2-chlorophenoxy)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[(3-chlorophenoxy)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[(4-chlorophenoxy)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(2-methoxyphenoxy)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(3-methoxyphenoxy)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(4-methoxyphenoxy)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[(3-cyanophenoxy)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[(4-chloro-2-methoxyphenoxy)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[(3,4-dimethoxyphenoxy)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

{4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl phenylcarbamate;

{4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl isopropylcarbamate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(piperidin-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[(dimethylamino)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(4-phenylpiperazin-1-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N-hydroxy-4-[(isoxazol-3-ylamino)methyl]-1,2,5-oxadiazole-3-carboximidamide;

4-{[(1-benzylpiperidin-4-yl)amino]methyl}-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[4-(2-methoxyphenyl)piperazin-1-yl]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(pyridin-2-ylmethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-phenylethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(3-phenylpropyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4({[(1R)-1-phenylethyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

4-{[(2-chlorobenzyl)amino]methyl}-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(4-phenylbutyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-(3,4-dihydroisoquinolin-2(1H)-ylmethyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-(2,3-dihydro-1H-indol-1-ylmethyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(morpholin-4-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

3-(4-[(2-morpholin-4-ylethyl)amino]methyl-1,2,5-oxadiazol-3-yl)-4-[3-(trifluoromethyl)phenyl]-1,2,4-oxadiazol-5(4H)-one;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(methylsulfonyl)(2-morpholin-4-ylethyl)amino]-methyl-1,2,5-oxadiazole-3-carboximidamide;

N-{4-[N-(3-chloro-4-fluoro-phenyl)-N′-hydroxy-carbamimidoyl]-furazan-3-ylmethyl}-benzamide;

N-(3-chloro-4-fluoro-phenyl)-N′-hydroxy-4-[(3-phenyl-ureido)-methyl]-furazan-3-carboxamidine;

4-(benzenesulfonylamino-methyl)-N-(3-chloro-4-fluoro-phenyl)-N′-hydroxy-furazan-3-carboxamidine;

benzyl({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl)carbamate;

N-(3-cyanophenyl)-N′-hydroxy-4-methyl-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-1H-tetrazol-1-yl)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-2H-tetrazol-2-yl)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(1H-tetrazol-5-ylamino)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[3-(1 H-imidazol-1-yl)propyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-morpholin-4-ylethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

{4-[({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)amino]phenyl}acetic acid;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(4-hydroxypiperidin-1-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[4-(2-hydroxyethyl)piperazin-1-yl]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[(1R)-2-hydroxy-1-phenylethyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-hydroxyethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-pyridin-4-ylethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(tetrahydrofuran-2-ylmethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(1,3-thiazol-2-ylmethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

4-({[4-(aminosulfonyl)benzyl]amino}methyl)-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

{4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl dimethylcarbamate;

4-{[4-(aminosulfonyl)phenoxy]methyl}-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[4-(methylsulfonyl)phenoxy]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4(1H-imidazol-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4(1H-1,2,4-triazol-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

4-[({2-[4-(aminosulfonyl)phenyl]ethyl}amino)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(2H-tetrazol-2-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4(1H-tetrazol-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

{4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl morpholine-4-carboxylate;

2-[4-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methoxy)phenyl]acetamide;

4-(aminomethyl)-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-1H-tetrazol-1-yl)methyl]-N-[3-(trifluoromethyl)phenyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-benzyl-1H-tetrazol-1-yl)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-benzyl-2H-tetrazol-2-yl)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

[2-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-2H-tetrazol-5-yl]acetic acid;

N-(3-chloro-4-fluorophenyl)-4-(cyanomethyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(2-oxo-1,3-oxazolidin-3-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[2-(dimethylamino)ethyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(3-morpholin-4-ylpropyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-pyridin-4-yl-2H-tetrazol-2-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

4-({[4-(aminosulfonyl)benzyl]amino}methyl)-N-[3-(trifluoromethyl)phenyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(trifluoromethyl)phenyl]-N′-hydroxy-4-(1H-tetrazol-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(trifluoromethyl)phenyl]-N′-hydroxy-4-(2H-tetrazol-2-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(trifluoromethyl)phenyl]-N′-hydroxy-4-{[(2-morpholin-4-ylethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(pyridin-3-ylmethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-pyrrolidin-1-ylethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[2-(1H-imidazol-4-yl)ethyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[2-(2-oxopyrrolidin-1-yl)ethyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-choro-4-fluorophenyl)-N′-hydroxy-4-[(5-methyl-1H-tetrazol-1-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-methyl-2H-tetrazol-2-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-N-(2-morpholin-4-ylethyl)acetamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[5-(methylthio)-2H-tetrazol-2-yl]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[5-(methylthio)-1H-tetrazol-1-yl]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-phenyl-1H-tetrazol-1-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-phenyl-2H-tetrazol-2-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({5-[3-(trifluoromethoxy)phenyl]-2H-tetrazol-2-yl}-methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-pyridin-3-yl-2H-tetrazol-2-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-pyrrolidin-1-yl-2H-tetrazol-2-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({5-[3-(trifluoromethoxy)phenyl]-1H-tetrazol-1-yl}-methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-pyridin-2-yl-1H-tetrazol-1-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(5-pyrrolidin-1-yl-1H-tetrazol-1-yl)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-{[5-(4-fluorophenyl)-1H-tetrazol-1-yl]methyl}-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({5-[2-(dimethylamino)ethyl]-1H-tetrazol-1-yl}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide

N-(3-chloro-4-fluorophenyl)-4-{[5-(4-fluorophenyl)-2H-tetrazol-2-yl]methyl}-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({5-[2-(4-chlorophenoxy)ethyl]-2H-tetrazol-2-yl}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({5-[5-(trifluoromethyl)pyridin-2-yl]-2H-tetrazol-2-yl}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({5-[2-(4-chlorophenoxy)ethyl]-1H-tetrazol-1-yl}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[({2-[(2R,6S)-2,6-dimethylmorpholin-4-yl]ethyl}amino)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[2-(2-methylpiperidin-l-yOethyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-{[(1,1-dimethyl-2-morpholin-4-ylethyl)amino]methyl}-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-piperazin-l-ylethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(1-ethylpyrrolidin-2-yl)methyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[2-(dimethylamino)propyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-methyl-2-morpholin-4-ylpropyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(2-methyl-2-piperidin-1-ylpropyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(piperidin-2-ylmethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[2-(1,1-dioxidothiomorpholin-4-yl(ethyl]-amino}-methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(piperidin-3-ylamino)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(pyrrolidin-3-ylmethyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-2-methylpropanamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-2,2-dimethylpropanamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-2-phenylacetamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-3-phenylpropanamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-1,3-thiazole-5-carboxamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)cyclopentanecarboxamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(methylsulfonyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

4-({[(benzylamino)carbonyl]amino}methyl)-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[({[(2-phenylethyl)-amino]carbonyl}-amino)methyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[(isopropylamino)-carb onyl]amino}-methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)morpholine-4-carboxamide;

N-(3-chloro-4-fluorophenyl)-4-({[(dimethylamino)carbonyl]amino }methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl) acetamide;

methyl ({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl)carbamate;

isobutyl({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl)carbamate;

benzyl({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl)carbamate;

N-(3-chloro-4-fluorophenyl)-4-{[(ethylsulfonyl)amino]methyl}-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(5-{[({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl)amino]sulfonyl}-4-methyl-1,3-thiazol-2-yl)acetamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[({5-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]-2-thienyl}sulfonyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[(1-methyl-1H-imidazol-4-yl)sulfonyl]amino}-methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(2,4-dimethyl-1,3-thiazol-5-yl)sulfonyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(3,5-dimethylisoxazol-4-yl)sulfonyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[(1,3,5-trimethyl-1H-pyrazol-4-yl)sulfonyl]amino}-methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(1,2-dimethyl-1H-imidazol-4-yl)sulfonyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(propylsulfonyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-{[(cyclopropylsulfonyl)amino]methyl }-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{[(3-methylisothiazol-5-yl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

ethyl 3-4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-ylpropanoate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(3-morpholin-4-ylpropyl)-1,2,5-oxadiazole-3-carboximidamide;

4-[(aminosulfonyl)amino]methyl-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-([(E/Z)-(cyanoimino)(methylamino)methyl]aminomethyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-([(methylamino)-sulfonyl]aminomethyl)-1,2,5-oxadiazole-3-carboximidamide;

4-[(aminocarbonyl)amino]methyl-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-([(tert-butylamino)carbonyl]aminomethyl)-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-([(3-morpholin-4-ylpropyl)sulfonyl]aminomethyl)-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(piperidin-4-ylsulfonyl)amino]methyl-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

4-[([1-(aminosulfonyl)piperidin-4-yl]sulfonylamino)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-([(1-acetylpiperidin-4-yl)sulfonyl]aminomethyl)-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[5-(morpholin-4-ylmethyl)-2H-tetrazol-2-yl]methyl-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[5-(morpholin-4-ylmethyl)-1H-tetrazol-1-yl]methyl-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

4-[(5-amino-1,3,4-thiadiazol-2-yl)thio]methyl-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-4H-1,2,4-triazol-3-yl)thio]methyl-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-4H-1,2,4-triazol-3-yl)sulfonyl]methyl-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[({(E/Z)-(cyanoimino)[(4-methoxybenzyl)amino]methyl}amino)-methyl]-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

4-[({(E/Z)-[(aminocarbonyl)imino][(4-methoxybenzyl)amino]methyl}amino)methyl]-N-(3-chloro-4-fluorophenyl)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-({[(E/Z)-amino(nitroimino)methyl]amino}methyl)-N-(3-chloro-4-fluorophenyl)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

4-({[amino(imino)methyl]amino}methyl)-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(4H-1,2,4-triazol-4-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

4-[2-(5-amino-1H-tetrazol-1-yl)ethyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[2-(5-amino-2H-tetrazol-2-yl)ethyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[2-(1H-imidazol-1-yl)ethyl]-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(2-morpholin-4-ylethyl)-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[2-(4-methylpiperazin-1-yl)ethyl]-1,2,5-oxadiazole-3-carboximidamide bis(trifluoroacetate);

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[2-(4H-1,2,4-triazol-4-yl)ethyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[2-(1H-1,2,4-triazol-1-yl)ethyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[2-(1H-tetrazol-1-yl(ethyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[2-(2H-tetrazol-2-yl(ethyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[2-(dimethylamino)ethyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(2-thiomorpholin-4-ylethyl)-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-(2-pyrrolidin-1-ylethyl)-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{2-[isopropyl(methyl)amino]ethyl}-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-{2-[(methylsulfonyl)amino]ethyl}-1,2,5-oxadiazole-3-carboximidamide;

4-{2-[(aminosulfonyl)amino]ethyl}-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-{[(aminosulfonyl)amino]methyl}-N-(3-bromo-4-fluorophenyl)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-{[(aminosulfonyl)amino]methyl}-N-hydroxy-N-[3-(trifluoromethyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide;

N-({4-[(E/Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-N′-cyanomorpholine-4-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[({(E/Z)-(cyanoimino)[(2-morpholin-4-ylethyl)amino]methyl}-amino)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[({(E/Z)-[(aminocarbonyl)imino][(2-morpholin-4-ylethyl)amino]methyl}amino)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-{[((E/Z)-(cyanoimino){[2- (dimethylamino) ethyl]amino}methyl)-amino]methyl}-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-{[((E/Z)-(cyanoimino){[2-(1H-imidazol-5-yl)ethyl]amino}-methyl)amino]methyl}-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-{[((E/Z)-[(aminocarbonyl)imino]{[2-(1H-imidazol-5-yl)ethyl]amino}methyl)amino]methyl}-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-[({(E/Z)-(cyanoimino)[(2-hydroxy-1-methylethyl)amino]methyl}-amino)methyl]-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(E/Z)-(cyanoimino)(isopropylamino)methyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl) -4-[({(E/Z)-(cyanoimino)[(2-methoxy-1-methylethyl)amino]-methyl}amino)methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-4-[({(E/Z)-(cyanoimino)[(2-methoxyl(ethyl)amino]methyl}amino)-methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-4-({[(E/Z)-(cyanoimino)(tetrahydro-2H-pyran-4-ylamino)methyl]-amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-4-{[((E/Z)-(cyanoimino){[(1-ethylpyrrolidin-2-yl)methyl]amino}-methyl)amino]methyl}-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide bis (trifluoroacetate);

4-({[(E/Z)-amino(cyanoimino)methyl]amino}methyl)-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-4-[({(E/Z)-(cyanoimino)[(2-hydroxyl(ethyl)amino]methyl}amino)-methyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-chloro-4-fluorophenyl)-4-({[(E/Z)-(cyanoimino) (dimethylamino)methyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(E/Z)-(cyanoimino)(ethylamino)methyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-bromo-4-fluorophenyl)-4-({[(E/Z)-(cyanoimino)(ethylamino)methyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-({[(E/Z)-(cyanoimino)(dimethylamino)methyl]amino}methyl)-N′-hydroxy-N-[3-(trifluoro-methyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide;

4-({[(E/Z)-(cyanoimino)(ethylamino)methyl]amino}methyl)-N′-hydroxy-N-[3-(trifluoromethyl)-phenyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-bromo-4-fluorophenyl)-4-({[(E/Z)-(cyanoimino)(dimethylamino)methyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-({[(E/Z)-(cyanoimino)(methylamino)methyl]amino}methyl)-N′-hydroxy-N-[3-(trifluoro-methyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-bromo-4-fluorophenyl)-4-({[(E/Z)-(cyanoimino)(methylamino)methyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-({[(E/Z)-amino(cyanoimino)methyl]amino}methyl)-N-(3-bromo-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-({[(E/Z)-amino(cyanoimino)methyl]amino}methyl)-N′-hydroxy-N-[3-(trifluoromethyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[(isopropylamino)sulfonyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-bromo-4-fluorophenyl)-N′-hydroxy-4-({[(methylamino)sulfonyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(ethylamino)sulfonyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(dimethylamino)sulfonyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(difluoromethyl)phenyl]-N′-hydroxy-4-(1H-tetrazol-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(difluoromethyl)phenyl]-N′-hydroxy-4-(2H-tetrazol-2-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-hydroxy-4-(4H-1,2,4-triazol-4-ylmethyl)-N-[3-(trifluoromethyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-bromo-4-fluorophenyl)-N′-hydroxy-4-(4H-1,2,4-triazol-4-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-1H-tetrazol-1-yl)methyl]-N-(3-bromo-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-2H-tetrazol-2-yl)methyl]-N-(3-bromo-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-1H-imidazole-2-carboxamide trifluoroacetate;

N-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-1H-pyrazole-4-carboxamide trifluoroacetate;

N-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-4-methyl-1,2,3-thiadiazole-5-carboxamide;

N-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-1H-imidazole-4-carboxamide trifluoroacetate;

N-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-1,2,3-thiadiazole-4-carboxamide;

5-amino-N-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl)-1,3,4-thiadiazole-2-carboxamide;

5-amino-N-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}methyl)-1H-pyrazole-4-carboxamide;

4-(aminomethyl)-N-(3-bromo-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-(3-bromo-4-fluorophenyl)-N′-hydroxy-4-{[(methylsulfonyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

4-(aminomethyl)-N′-hydroxy-N-[3-(trifluoromethyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-hydroxy-4-{[(methylsulfonyl)amino]methyl}-N-[3-(trifluoromethyl)phenyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-({[(2,2,2-trifluoroethyl)sulfonyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

N-(3-bromo-4-fluorophenyl)-N′-hydroxy-4-(1H-tetrazol-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

[1-({4-[(Z)-[(3-chloro-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-methyl)-1H-tetrazol-5-yl]acetic acid;

N-(3-chloro-4-fluorophenyl)-4-({[(2,4-dioxo-1,2,3 ,4-tetrahydropyrimidin-5-yl)sulfonyl]amino}-methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-4-({[(1,3-dimethyl-2,4-dioxo-1,2,3 ,4-tetrahydropyrimidin-5-yl)-sulfonyl]amino}methyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[3-(1H-tetrazol-1-yl)propyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[3-(2H-tetrazol-2-yl)propyl]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[3-(4H-1,2,4-triazol-4-yl)propyl]-1,2,5-oxadiazole-3-carboximidamide;

4-{3-[(aminosulfonyl)amino]propyl}-N-(3-chloro-4-fluorophenyl)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl) -4-(3-{[(E/Z)-(cyanoimino)(methylamino)methyl]amino}propyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

4-[(3-amino-4H-1,2,4-triazol-4-yl)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-1H-1,2,4-triazol-1-yl)methyl]-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-chloro-4-fluorophenyl)-N′-hydroxy-4-[(1,3,4-thiadiazol-2-ylamino)methyl]-1,2,5-oxadiazole-3-carboximidamide trifluoroacetate;

N-[3-(difluoromethyl)phenyl]-N-hydroxy-4-({[(methylamino)sulfonyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-1H-tetrazol-1-yl)methyl]-N′-[3-(difluoromethyl)phenyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-2H-tetrazol-2-yl)methyl]-N-(4-fluoro-3-methylphenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(difluoromethyl)phenyl]-N-hydroxy-4-(1H-tetrazol-1-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(difluoromethyl)phenyl]-N′-hydroxy-4-(2H-tetrazol-2-ylmethyl)-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(difluoromethyl)phenyl]-N′-hydroxy-4-{[(methylsulfonyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

4-{[(aminosulfonyl)amino]methyl}-N-[3-(difluoromethyl)phenyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-[3-(difluoromethyl)phenyl]-N′-hydroxy-4-({[(trifluoromethyl)sulfonyl]amino}methyl)-1,2,5-oxadiazole-3-carboximidamide;

4-{[bis(methylsulfonyl)amino]methyl}-N-[3-(difluoromethyl)phenyl]-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(5-amino-1H-tetrazol-1-yl)methyl]-N-(4-fluoro-3-methylphenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-{[(6-aminohexyl)amino]methyl}-N-(3-chloro-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(4-fluoro-3-methylphenyl)-N′-hydroxy-4-{[(methylsulfonyl)amino]methyl}-1,2,5-oxadiazole-3-carboximidamide;

4-[2-(5-amino-1H-tetrazol-1-yl)ethyl]-N-(3-bromo-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-bromo-4-fluorophenyl)-N′-hydroxy-4-{2-[(methylsulfonyl)amino]ethyl}-1,2,5-oxadiazole-3-carboximidamide;

4-{2-[(aminosulfonyl)amino]ethyl}-N-(3-bromo-4-fluorophenyl)-N′-hydroxy-1,2,5-oxadiazole-3-carboximidamide; and pharmaceutically acceptable salts thereof.

12. The method of claim 1 further comprising administering an anti-viral agent, a chemotherapeutic, an immunosuppressant, radiation, an anti-tumor vaccine, an anti-viral vaccine, cytokine therapy, a tyrosine kinase inhibitor, an anti-CTLA-4 antibody, or an anti-PD-1 antibody.

13. The method of claim 1 , wherein the cancer is melanoma.

14. The method of claim 13 further comprising administering a chemotherapeutic, radiation, an anti-tumor vaccine, or cytokine therapy.

15. The method of claim 1 , wherein the cancer is breast cancer.

16. The method of claim 1 , wherein the cancer is ovarian cancer.

17. The method of claim 1 , wherein the method is a method of inhibiting immunosuppression.