Patent ID: 7897621

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein: R 1 is selected from the group consisting of: (1) lower hydroxyalkyl, (2) cycloalkyl which is unsubstituted or substituted by hydroxy or lower hydroxyalkyl, and (3) —CH 2 —CR 9 R 10 -cycloalkyl, wherein R 9 is hydrogen or lower alkyl, and R 10 is hydrogen or hydroxy; R 2 is hydrogen; R 3 is selected from the group consisting of: (1) lower alkoxyalkyl, (2) lower halogenalkyl, and (3) lower heteroarylalkyl, wherein the heteroaryl group is unsubstituted or substituted once or twice by lower alkyl; R 4 and R 8 are hydrogen; and R 5 , R 6 and R 7 independently from each other are selected from the group consisting of: (1) hydrogen, (2) lower alkyl, (3) halogen, (4) lower halogenalkyl, (5) lower halogenalkoxy, (6) lower alkylsulfonylamino, and (7) cyano.