Patent ID: 8119685

Claim:
A compound of the following structural formula: wherein is optionally substituted aryl or optionally substituted heteroaryl; is optionally substituted aryl or optionally substituted heteroaryl; is aryl or heteroaryl; R 1 is NH 2 , OH or NH[(C 1-6 alkyl)C(O)NR 5 R 6 ]; R 2 is H, Cl — 6 alkyl, O(C 1-6 alkyl), C(O)R 4 , (C 1-6 alkyl)C(O)NR 5 R 6 , C(O)(C 1-6 alkyl)NR 5 R 6 , (C 1-6 alkyl)NR 5 R 6 or SO 2 (C 1-6 alkyl); R 3 is (C 1-6 alkyl)C(O)NR 5 R 6 , (C 1-6 alkyl)NR 5 R 6 ; R 4 is H or C 1-6 alkyl; R 5 is H, C 1-6 alkyl, aryl, heteroaryl or C(O)(C 1-6 alkyl), wherein said alkyl, aryl and heteroaryl groups are optionally substituted with one to three halo; R 6 is H, C 1-6 alkyl, aryl, heteroaryl or C(O)(C 1-6 alkyl), wherein said alkyl, aryl and heteroaryl groups are optionally substituted with one to three halo; or a stereoisomer or a pharmaceutically acceptable salt thereof.