Patent ID: 7511036

Claim:
A compound of the formula: wherein: R is hydrogen, methyl, hydroxymethyl or Î±-hydroxyethyl; R 1 and R 2 are independently selected from hydrogen, C 1 -C 6 alkyl, C 1 -C 6 hydroxyalkyl, C 3 -C 8 cycloalkyl, C 1 -C 6 alkenyl, C 1 -C 6 alkynyl, amino, monoalkylamino, dialkylaminoalkyl, and pyrrolidin-1-ylalkyl; and Y is selected from the group consisting of C 1 -C 6 alkyl, and substituted and unsubstituted aryl, wherein substituted aryl is substituted with one to three substituents selected from amino, C 1 -C 6 alkylamino, C 1 -C 6 dialkylamino, C 1 -C 6 alkoxy, C 1 -C 6 alkyl, cyano, nitro, C 1 -C 6 mono, di- or trifluoroalkyl, nitro, fluoro, chioro and bromo; with the provisos that: (a) if Y is aryl, then at least one of R 1 and R 2 is other than hydrogen, and (b) if R 2 is other than methyl; or a pharmaceutically acceptable salt thereof.