Patent ID: 7432288

Claim:
A compound of Formula I: or a pharmaceutically acceptable salt thereof, wherein R 1 is pyridyl(1-4C)alkyl wherein the pyridyl is optionally substituted by (1-4C)alkyl or a group of formula NR a R b in which R a and R b independently represent H or (1-4C)alkyl; R 2 is phenyl; and R 3 is selected from phenyl optionally substituted by one or more of the following: (1-3C)alkanoyl; (1-3C)alkoxy optionally substituted by one or more fluoro; (1-3C)alkylthio; or a group of formula NR a R b in which R a and R b independently represent H, (1-3C)alkyl or (1-3C)alkanoyl.