Patent ID: 7241764

Claim:
A compound of formula I, or a pharmaceutically acceptable salt thereof: wherein R 1 is selected from C 3-6 alkyl, C 6-10 aryl, C 2-9 heteroaryl, C 6-10 aryl-C 1-4 alkyl, C 2-9 heteroaryl-C 1-4 alkyl, C 3-10 cycloalkyl, C 3-10 cycloalkyl-C 1-4 alkyl, R 8 —C(═O)—, R 8 —S(═O) 2 —, R 8 —S(═O)—, R 8 —NHC(═O)—, R 8 —C(═S)— and R 8 —NH—C(═S)—, wherein R 8 is selected from C 3-6 alkyl, C 6-10 aryl, C 2-9 heteroaryl, C 6-10 aryl-C 1-4 alkyl, C 2-9 heteroaryl-C 1-4 alkyl, C 3-10 cycloalkyl, and C 3-10 cycloalkyl-C 1-4 alkyl, wherein said C 3-6 alkyl, C 6-10 aryl, C 2-9 heteroarly, C 6-10 aryl-C 1-4 alkyl, C 2-9 heteroarly-C 1-4 alkyl, C 3-10 cycloalkyl, and C 3-10 cycloalkyl-C 1-4 alkyl used in defining R 1 and R 8 are optionally substituted with one or more groups selected from —R, —NO 2 , —OR, —Cl, —Br, —I, —F, —CF 3 , —C(═O)R, —C(═O)OH, —NH 2 , —SH, —NHR, —NR 2 , —SR, —SO 3 H, —SO 2 R, —S(═O)R, —CN, —OH, —C(═O)OR, —C(═O)NR 2 , —NRC(═O)R, and —NRC(═O)—OR, wherein R is, independently, selected from —H, C 1-6 alkyl and phenyl; R 2 is selected from —H and C 1-6 alkyl optionally substituted with one or more groups selected from —CF 3 , —OH, C 1-3 alkoxy, and halogen; and R 3 is selected from —H, C 1-6 alkyl-O—C(═O)—, C 1-6 alkyl, C 3-6 cycloalkyl, and C 3-6 cycloalkyl-C 1-4 alkyl, wherein said C 1-6 alkyl-O—C(═O)—, C 1-6 alkyl, C 3-6 cycloalkyl, and C 3-6 cycloalkyl-C 1-4 alkyl are optionally substituted with one or more groups selected from C 1-6 alkyl, halogenated C 1-6 alkyl, —NO 2 , —CF 3 , C 1-6 alkoxy and halogen.