METHODS OF TREATING AND PREVENTING ALLOANTIBODY DRIVEN CHRONIC GRAFT VERSUS HOST DISEASE

1 . A method of treating alloantibody driven chronic graft versus host disease (cGVHD) in a patient, comprising administering to a patient in need thereof a therapeutically effective amount of a compound of Formula (A) having the structure:

wherein:

A is N;

R 1 is phenyl-O-phenyl or phenyl-S-phenyl;

R 2 and R 3 are independently H;

R 4 is L 3 -X-L 4 -G, wherein,

L 3 is optional, and when present is a bond, optionally substituted or unsubstituted alkyl, optionally substituted or unsubstituted cycloalkyl, optionally substituted or unsubstituted alkenyl, optionally substituted or unsubstituted alkynyl;

X is optional, and when present is a bond, —O—, —C(═O)—, —S—, —S(═O)—, —S(═O) 2 —, —NH—, —NR 9 —, —NHC(O)—, —C(O)NH—, —NR 9 C(O)—, —C(O)NR 9 —, —S(═O) 2 NH—, —NHS(═O) 2 —, —S(═O) 2 NR 9 —, —NR 9 S(═O) 2 —, —OC(O)NH—, —NHC(O)O—, —OC(O)NR 9 —, —NR 9 C(O)O—, —CH═NO—, —ON═CH—, —NR 10 C(O)NR 10 —, heteroaryl-, aryl-, —NR 10 C(═NR 11 )NR 10 —, —NR 10 C(═NR 11 )—, —C(═NR 11 )NR 10 —, —OC(═NR 11 )—, or —C(═NR 11 )O—;

L 4 is optional, and when present is a bond, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted alkynyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl, substituted or unsubstituted heterocycle;

or L 3 , X and L 4 taken together form a nitrogen containing heterocyclic ring;

G is

wherein,

R 6 , R 7 and R 8 are independently selected from among H, halogen, CN, OH, substituted or unsubstituted alkyl or substituted or unsubstituted heteroalkyl or substituted or unsubstituted cycloalkyl, substituted or unsubstituted heterocycloalkyl, substituted or unsubstituted aryl, substituted or unsubstituted heteroaryl;

each R 9 is independently selected from among H, substituted or unsubstituted lower alkyl, and substituted or unsubstituted lower cycloalkyl;

each R 10 is independently H, substituted or unsubstituted lower alkyl, or substituted or unsubstituted lower cycloalkyl; or

two R 10 groups can together form a 5-, 6-, 7-, or 8-membered heterocyclic ring; or

R 10 and R 11 can together form a 5-, 6-, 7-, or 8-membered heterocyclic ring; or

each R 11 is independently selected from H or substituted or unsubstituted alkyl; or a pharmaceutically acceptable salt thereof, thereby treating the GVHD in the patient.

2 - 20 . (canceled)