Patent ID: 7410977

Claim:
A compound of structural formula I: a pharmaceutically acceptable salt or a stereoisomer thereof, wherein: X and Y are each independently chosen from hydrogen, halogen, hydroxy, and C 1-3 alkyl, wherein said alkyl is optionally substituted with one to seven fluorine atoms, provided that when X is methyl than Y is other than methyl; or X and Y, together with the carbon atom to which they are attached, can optionally form a C 3-6 cycloalkyl group; and Z is chosen from hydrogen, carbonyl(C 1-3 alkyl), hydroxy, C 1-4 alkoxy, halogen, hydroxymethyl, (C 0-6 alkyl) 2 amino, and C 1-3 alkyl, wherein said alkoxy and alkyl are each optionally substituted with one to seven fluorine atoms; and provided that when X is hydrogen, Y is other than hydrogen.