Patent ID: 7544683

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein: R 1 is a C 1 -C 8 -alkyl or C 3 -C 7 -cycloalkyl; and R 2 is selected from the group consisting of: (a) phenyl which is substituted by heteroaryl or heterocyclyl, wherein said heteroaryl or heterocyclyl is unsubstituted or substituted with one or two substituents independently selected from the group consisting of: (1) C 1 -C 8 -alkyl, (2) C 3 -C 7 -cycloalkyl, (3) halogen, (4) halogen-C 1 -C 8 -alkyl, (5) oxo, (6) cyano, (7) C 1 -C 8 -alkoxy, (8) halogen-C 1 -C 8 -alkoxy, and (9) hydroxy-C 1 -C 8 -alkyl, and (b) heteroaryl, wherein the heteroaryl is unsubstituted or substituted with one or two substituents independently selected from the group consisting of: (1) C 1 -C 8 -alkyl, (2) halogen, (3) halogen-C 1 -C 8 -alkyl, (4) cyano, (5) C 1 -C 8 -alkoxy, (6) C 1 -C 8 -alkylsulfonyl, (7) C 1 -C 8 -alkylaminocarbonyl, (8) di-C 1 -C 8 -alkylaminocarbonyl, (9) heterocyclyl which is unsubstituted or substituted with one or two substituents independently selected from the group consisting of C 1 -C 8 -alkyl, halogen and oxo, and (10) phenyl which is unsubstituted or substituted by one to three substituents independently selected from the group consisting of C 1 -C 8 -alkyl, halogen, halogen-C 1 -C 8 -alkyl, cyano, and C 1 -C 8 -alkoxy.