Patent ID: 8178583

Claim:
A compound of formula I: or a pharmaceutically acceptable salt thereof, wherein: R is selected from the group consisting of: (1) —SR 1 wherein R 1 is hydrogen or a C(O)C 1 -C 10 alkyl; and (2) a group of formula II: R 2 is a C 1 -C 10 alkyl; and Q is selected from the group consisting of: (1) a group of formula IIa: (2) a group of formula IIb: wherein X 1 , X 2 , X 3 , X 4 , X 5 and X 6 are independently selected from the group consisting of hydrogen, C 1 -C 6 alkyl, C 3 -C 8 cycloalkyl, halo-C 1 -C 6 alkyl, halo-C 3 -C 8 cycloalkyl, halo-C 1 -C 6 alkoxy, halogen, cyano, nitro, acyl and aryl.