Patent ID: RE45314

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein: R 1 is H; R 2 is H; R 3 is halo, methylsulfonyl or perfluoromethyl; R 3 , R 4 , R 5 , R 6 and R 7 are independently selected from H , halo, perfluoromethyl and alkylsulfonyl, provided that: (1) one of R 3 and R 7 is other than H; (2) at least one of R 3 , R 4 , R 5 , R 6 and R 7 is other than halo; and (3) when one of R 3 or R 7 is halo and the R 3 or R 7 that is not halo is H and one of R 4 or R 6 is halo and the R 4 or R 6 that is not halo is H, R 5 is other than halo or H .