Patent ID: 8916574

Claim:
A compound of formula I: or pharmaceutically acceptable salts thereof, wherein, R is a C 1-6 -alkylsulfinyl, or a C 1-6 alkylsulfinyl substituted with one or more halogens, or a C 1-6 -alkylthio, or a C 1-6 alkylthio substituted with one or more halogens, or a C 1-6 -alkylamido, or a C 1-6 -alkysulfonamido substituted with one or more halogens, or a group of formula wherein R 1 and R 2 each are independently selected from the group consisting of hydrogen, a C 1-6 -alkyl, and a C 1-6 -alkyl substituted with one or more halogens.