Patent ID: 7429607

Claim:
A pharmaceutical composition comprising a compound of formula I: or a pharmaceutically acceptable salt thereof, together with a pharmaceutically acceptable carrier or diluent, wherein R 4 is selected from the group consisting of H, and optionally substituted C 1-6 alkyl, C 3-7 cycloalkyl, C 3-7 cycloalkyl-C 1-4 alkyl, and phenyl-C 1-4 alkyl; R 1 is an optionally substituted C 9-14 aryl group comprising at least two fused rings; R 2 and R 3 are either: (i) independently selected from H, R, R′, SO 2 R, C(═O)R, (CH 2 ) n NR 5 R 6 , where n is from 1 to 4 and R 5 and R 6 are independently selected from H and R, where R is optionally substituted C 1-4 alkyl, and R′ is optionally substituted phenyl-C 1-4 alkyl, or (ii) together with the nitrogen atom to which they are attached, form an optionally substituted C 5-7 heterocyclic group.