Patent ID: 7217731

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) —(CO)—C 1-6 alkyl, (5) —(CO)—NH 2 , (6) —(CO)—NHC 1-6 alkyl, and (7) —(CO)—N(C 1-6 alkyl)(C 1-6 alkyl); X is independently selected from the group consisting of: (1) hydrogen, (2) fluorine, and (3) methyl; and pharmaceutically acceptable salts thereof and individual enantiomers and diastereomers thereof.