Patent ID: 7652058

Claim:
A compound of the formula I: wherein: R 1 is selected from the group consisting of: (1) hydrogen, (2) C 1-6 alkyl, which is unsubstituted or substituted with halogen, hydroxyl or phenyl, (3) cyclopentenone, which is unsubstituted or substituted with hydroxyl or methyl, (4) furanone, which is unsubstituted or substituted with methyl, (5) —(CO)—C 1-6 alkyl, (6) —(CO)—NH 2 , (7) —(CO)—NHC 1-6 alkyl, and (8) —(CO)—N(C 1-6 alkyl)(C 1-6 alkyl); X, Y and Z are independently selected from the group consisting of: (1) hydrogen, (2) halo, and (3) methyl; and pharmaceutically acceptable salts thereof and individual enantiomers and diastereomers thereof.