Patent ID: 7074802

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof, in which: R 1 and R 2 are independently selected from the group consisting of H, C 1-6 alkyl, C 2-6 alkenyl, C 3-6 alkynyl, C 3-10 cycloalkylC 0-6 alkyl and C 4-12 bridged cycloalkyl; R 3 is selected from the group consisting of C 1-6 alkyl, NH 2 and R 5 CONH; R 4 is selected from the group consisting of CH 2 F, CHF 2 , CF 3 CH 2 , CF 3 CHF and CF 3 CF 2 ; and R 5 is selected from the group consisting of H, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 alkylOC 1-6 alkyl, phenyl, HO 2 CC 1-6 alkyl, C 1-6 alkylOCOC 1-6 alkyl, C 1-6 alkylOCO, H 2 NC 1-6 alkyl, C 1-6 alkylOCONHC 1-6 alkyl and C 1-6 alkylCONHC 1-6 alkyl.