Patent ID: 7511033

Claim:
A compound of formula (I): wherein: R 1 is H and R 2 is â€”S(O) 2 â€”NR a R b or R 2 is H and R 1 is â€”S(O) 2 â€”NR a R b ; R 3 is H, fluoro, chloro, C 1-6 -alkyl, C 1-6 -haloalkyl, C 1-6 -alkoxy, C 1-6 -haloalkoxy or NR a R b ; R 4 is chloro, C 1-6 -haloalkyl or aryl optionally substituted by halogen; and R a and R b are independently selected from the group consisting of H, C 1-6 -alkyl and C 2-6 -hydroxyalkyl; or a pharmaceutically acceptable salt thereof.