Modulators of indoleamine 2,3-dioxygenase and methods of using the same

1. A method of treating a cancer selected from lung cancer, renal cancer, and cancer of the head and neck in a patient in need thereof, comprising administering to said patient a therapeutically effective amount of a compound of formula:

or a pharmaceutically acceptable salt thereof, in combination with an anti-PD-1 antibody,

wherein:

W, X 1 , and X 2 are independently selected from (CR a R b ) t , (CR a R b ) u O(CR a R b ) v , (CR a R b ) u C(O)(CR a R b ) v , (CR a R b ) u C(O)NR(CR a R b ) v , (CR a R b ) u C(O)O(CR a R b ) v , (CR a R b ) u C(S)(CR a R b ) u , (CR a R b ) u C(S)NR c (CR a R b ) v , (CR a R b ) u S(O)(CR a R b ) v , (CR a R b ) u S(O)NR c (CR a R b ) v , (CR a R b ) u S(O) 2 (CR a R b ) v , (CR a R b ) u S(O) 2 NR c (CR a R b ) v , (CR a R b ) u NR c (CR a R b ) v , and (CR a R b ) u C(═NR d )NR c (CR a R b ) v ;

R 2 is H, C 1-6 alkyl, or C 3-7 cycloalkyl;

R 3a and R 5a are independently selected from C 1-8 alkyl, C 2-8 alkenyl, C 2-8 alkynyl, aryl, cycloalkyl, heteroaryl, and heterocycloalkyl, 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 1-4 haloalkyl, Cy 1 , CN, NO 2 , OR e1 , SR e1 , C(O)R f1 , C(O)NR g1 R h1 , C(O)OR e1 , OC(O)R f1 , OC(O)NR g1 R h1 , NR g1 C(O)NR g1 R h1 , NR g1 R h1 , NR g1 C(O)R f1 , NR g1 C(O)OR e1 , P(R f1 ) 2 , P(OR e1 ) 2 , P(O)R e1 R f1 , P(O)OR e1 OR f1 , S(O)R f1 , S(O)NR g1 R h1 , S(O) 2 R f1 , and S(O) 2 NR g1 R h1 ;

R 3b 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 1-4 haloalkyl, Cy 2 , CN, NO 2 , OR e1 , SR e1 , C(O)R f1 , C(O)NR g1 R h1 , C(O)OR e1 , OC(O)R f1 , OC(O)NR g1 R h1 , NR g1 C(O)NR g1 R h1 , NR g1 R h1 , NR g1 C(O)R f1 , NR g1 C(O)OR e1 , P(R f1 ) 2 , P(OR e1 ) 2 , P(O)R e1 R f1 , P(O)OR e1 OR f1 , S(O)R f1 , S(O)NR g1 R h1 , S(O) 2 R f1 , and S(O) 2 NR g1 R h1 ;

R 5b is selected from H, C 1-8 alkyl, C 2-8 alkenyl, C 2-8 alkynyl, aryl, cycloalkyl, heteroaryl, and heterocycloalkyl, wherein said C 1-8 alkyl, C 2-8 alkenyl, C 2-8 alkynyl, aryl, cycloalkyl, heteroaryl, and heterocycloalkyl are 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 1-4 haloalkyl, Cy 2 , CN, NO 2 , OR e1 , SR e1 , C(O)R f1 , C(O)NR g1 R h1 , C(O)OR e1 , OC(O)R f1 , OC(O)NR g1 R h1 , NR g1 C(O)NR g1 R h1 , NR g1 R h1 , NR g1 C(O)R f1 , NR g1 C(O)OR e1 , P(R f1 ) 2 , P(OR e1 ) 2 , P(O)R e1 R f1 , P(O)OR e1 OR f1 , S(O)R f1 , S(O)NR g1 R h1 , S(O) 2 R f1 , and S(O) 2 NR g1 R h1 ;

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, CN, NO 2 , OR e3 , SR e3 C(O)R f3 , C(O)NR g3 R h3 , C(O)OR e3 , OC(O)R f3 , OC(O)NR g3 R h3 , NR g3 R h3 , NR g3 C(O)R h3 , NR g3 C(O)OR e3 , P(R f3 ) 2 , P(OR e3 ) 2 , P(O)R e3 R f3 , P(O)OR e3 OR f3 , S(O)R f3 , S(O)NR g3 R h3 , S(O) 2 R f3 , and S(O) 2 NR g3 R h3 ;

R a and R b are independently selected from H, halo, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-4 haloalkyl, aryl, cycloalkyl, heteroaryl, heterocycloalkyl, arylalkyl, cycloalkylalkyl, heteroarylalkyl, heterocycloalkylalkyl, CN, NO 2 , OR e4 , SR e4 , C(O)R f4 , C(O)NR g4 R h4 , C(O)OR e4 OC(O)R f4 , OC(O)NR g4 R h4 , NR g4 R h4 , NR g4 C(O)R h4 , NR g4 C(O)OR e4 , P(R f4 ) 2 , P(OR e4 ) 2 , P(O)R e4 R f4 , P(O)OR e4 OR f4 , S(O)R f4 , S(O)NR g4 R h4 , S(O) 2 R f4 , and S(O) 2 NR g4 R h4 ;

R c is H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;

R d is H, OR d1 , CN or NO 2 ;

R d1 is H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, arylalkyl, or cycloalkylalkyl;

R e1 , R e3 , and R e4 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 f1 , R f3 , and R f4 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 g1 , R g3 , and R g4 are independently selected from H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, arylalkyl, and cycloalkylalkyl;

R h1 , R h3 , and R h4 are independently selected from H, C 1-6 alkyl, C 1-6 haloalkyl, C 2-6 alkenyl, C 2-6 alkynyl, aryl, cycloalkyl, arylalkyl, and cycloalkylalkyl;

or R g1 and R h1 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;

or R g3 and R h3 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;

or R g4 and R h4 together with the N atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocycloalkyl group;

a is 0 or 1;

b is 0 or 1;

m is 1;

n is 0 or 1;

p is 0 or 1;

t is, independently, 1, 2, 3, 4, 5 or 6;

u is, independently, 0, 1, 2, 3, 4, 5 or 6; and

v is, independently, 0, 1, 2, 3, 4, 5 or 6.

2. The method of claim 1 , wherein the antibody is administered simultaneously with said compound or salt.

3. The method of claim 1 , wherein the antibody is administered sequentially to said compound or salt.

4. The method of claim 1 , wherein said cancer is lung cancer.

5. The method of claim 1 , wherein said cancer is renal cancer.

6. The method of claim 1 , wherein said cancer is cancer of the head and neck.

7. The method of claim 1 , wherein R 2 is H.

8. The method of claim 7 , wherein n is 0.

9. The method of claim 8 , wherein p is 1.

10. The method of claim 9 , wherein R 5b is H.

11. The method of claim 10 , wherein a is 0.

12. The method of claim 11 , wherein b is 0.

13. The method of claim 12 , wherein R 3b is phenyl 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 1-4 haloalkyl, Cy 2 , CN, NO 2 , OR e1 , SR e1 , C(O)R f1 , C(O)NR g1 R h1 , C(O)OR e1 , OC(O)R f1 , OC(O)NR g1 R h1 , NR g1 C(O)NR g1 R h1 , NR g1 R h1 , NR g1 C(O)R f1 , NR g1 C(O)OR e1 , P(R f1 ) 2 , P(OR e1 ) 2 , P(O)R e1 R f1 , P(O)OR e1 OR f1 , S(O)R f1 , S(O)NR g1 R h1 , S(O) 2 R f1 , and S(O) 2 NR g1 R h1 .

14. The method of claim 13 , wherein the cancer is lung cancer.

15. The method of claim 13 , wherein the cancer is renal cancer.

16. The method of claim 13 , wherein the cancer is cancer of the head and neck.

17. The method of claim 11 , wherein b is 1.

18. The method of claim 17 , wherein W is (CR a R b ) t or (CR a R b ) u O(CR a R b ) v .

19. The method of claim 18 , wherein R 3b is heteroaryl, 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 1-4 haloalkyl, Cy 2 , CN, NO 2 , OR e1 , SR e1 , C(O)R f1 , C(O)NR g1 R h1 , C(O)OR e1 , OC(O)R f1 , OC(O)NR g1 R h1 , NR g1 C(O)NR g1 R h1 , NR g1 R h1 , NR g1 C(O)R f1 , NR g1 C(O)OR e1 , P(R f1 ) 2 , P(OR e1 ) 2 , P(O)R e1 R f1 , P(O)OR e1 OR f1 , S(O)R f1 , S(O)NR g1 R h1 , S(O) 2 R f1 , and S(O) 2 NR g1 R h1 .

20. The method of claim 1 , wherein said compound is selected from:

N-benzyl-4-(benzylamino)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

4-[(Anilinocarbonyl)amino]-N-(3-chlorophenyl)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

tert-Butyl {4-[({4-[(E,Z)-[(3-chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}amino)carbonyl]benzyl}carbamate;

4-(Aminomethyl)-N-{4-[(E,Z)-[(3-chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

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

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

N-(3-Bromo-4-fluorophenyl)-N-hydroxy-4-(methylamino)-1,2,5-oxadiazole-3-carboximidamide;

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

tert-Butyl 4-{4-[({4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}amino)carbonyl]benzyl}piperazine-1-carboxylate;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-4-(piperazin-1-ylmethyl)benzamide;

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

N(4)-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-N(1)-phenylpiperidine-1,4-dicarboxamide;

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

4-[(Benzoylamino)methyl]-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino]-(hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

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

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

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

N-(3-Bromo-4-fluorophenyl)-N-hydroxy-4-{[4-(morpholin-4-ylmethyl)benzyl]amino}-1,2,5-oxadiazole-3-carboximidamide;

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

N-(3-Bromo-4-fluorophenyl)-N-hydroxy-4-[(pyridin-3-ylmethyl)amino]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-Cyano-4-fluorophenyl)-N-hydroxy-4-[(pyridin-4-ylmethyl)amino]-1,2,5-oxadiazole-3-carboximidamide;

4-[(3-Cyanobenzyl)amino]-N-(3-cyano-4-fluorophenyl)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-Bromo-4-fluorophenyl)-N-hydroxy-4-[(1H-tetrazol-5-ylmethyl)amino]-1,2,5-oxadiazole-3-carboximidamide;

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

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}nicotinamide;

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}isonicotinamide;

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-2-methoxybenzamide;

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-methoxybenzamide;

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-4-methoxybenzamide;

2-Chloro-N-{4-[(E,Z)-[(3-chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

3-Chloro-N-{4-[(E,Z)-[(3-chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

4-Chloro-N-{4-[(E,Z)-[(3-chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3,3-dimethylbutanamide;

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-4-iodobenzamide;

N-{4-[(E,Z)-[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-4-cyanobenzamide;

N-{4-[(E,Z)-{[4-Fluoro-3-(trifluoromethyl)phenyl]amino}(hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}nicotinamide;

N-{4-[(E,Z)-{[4Fluoro-3-(trifluoromethyl)phenyl]amino}(hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}isonicotinamide;

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

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

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

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

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

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

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

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

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

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

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

4-(Acetylamino)-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

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

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

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

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

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

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

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

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

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

4-(Aminomethyl)-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

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

N-(3-Bromo-4-fluorophenyl)-4-{[(cyclopentylamino)carbonyl]amino}-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-Bromo-4-fluorophenyl)-4-({[(3-cyanophenyl)amino]carbonyl}amino)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

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

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

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

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

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

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

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

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

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

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

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-pyridin-3-ylpropanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}quinoline-6-carboxamide;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(3-bromophenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(4-bromophenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(4-chlorophenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(3-chlorophenyl)propanamide;

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

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(2-chlorophenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(3-methylphenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(3-(trifluoromethyl)phenyl)propanamide;

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(2-methoxyphenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(3-methoxyphenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(4-methoxyphenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(4-methylphenyl)propanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-[4-(trifluoromethyl)phenyl]propanamide;

3-[2,5-Bis(trifluoromethyl)phenyl]-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}propanamide;

3-[3, 5-Bis(trifluoromethyl)phenyl]-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}propanamide;

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

2-Benzyl-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3,3-dimethylbutanamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-1-[4-(trifluoromethyl)pyrimidin-2-yl]piperidine-4-carboxamide;

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

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

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

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-2,4,6-trichlorobenzamide;

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

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

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-4-(trifluoromethoxy)benzamide;

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

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

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

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-2-(2,6-dichlorobenzyl)-1,3-thiazole-4-carboxamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-2,6-dimethoxybenzamide;

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

5-Bromo-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}nicotinamide;

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

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

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

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

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-4-(morpholin-4-ylmethyl)benzamide;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-4-[(1,1-dioxidothiomorpholin-4-yl)methyl]benzamide;

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

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

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

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

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

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

tert-Butyl 4-{4-[({4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}amino)carbonyl]-1,3-thiazol-2-yl}piperidine-1-carboxylate;

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

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

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

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

tert-Butyl 3-[({4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}amino)carbonyl]piperidine-1-carboxylate;

N-{4-[(E,Z)-[(3-Bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-3-(3-nitrophenyl)propanamide;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

4-[(Acetylamino)methyl]-N-{4-[(E,Z)-[(3-bromo-4-fluorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

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

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

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

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

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

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

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

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

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

N-(3-Bromo-4-fluorophenyl)-N-hydroxy-4-[(1,3-thiazol-4-ylmethyl)amino]-1,2,5-oxadiazole-3-carboximidamide;

N-(3-Bromo-4-fluorophenyl)-4-[(4-cyanobenzyl)amino]-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

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

N-(3-Bromo-4-fluorophenyl)-N-hydroxy-4-{[4-(piperazin-1-ylmethyl)benzyl]amino}-1,2,5-oxadiazole-3-carboximidamide;

N-(3-Bromo-4-fluorophenyl)-4-({4-[(4-ethylpiperazin-1-yl)methyl]benzyl}amino)-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-(3-Bromo-4-fluorophenyl)-N-hydroxy-4-[(pyridin-4-ylmethyl)amino]-1,2,5-oxadiazole-3-carboximidamide; and

N-(3-Bromo-4-fluorophenyl)-4-[(3-cyanobenzyl)amino]-N-hydroxy-1,2,5-oxadiazole-3-carboximidamide;

N-{4-[[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}-2-phenylacetamide;

N-{4-[[(3-Chlorophenyl)amino](hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide; and

N-{4-[(Benzylamino)(hydroxyimino)methyl]-1,2,5-oxadiazol-3-yl}benzamide;

or a pharmaceutically acceptable salt thereof.