Patent ID: 7649004

Claim:
A compound of the formula: or a pharmaceutically acceptable salt or solvate thereof, wherein: R 1 is (C 1 -C 6 )alkyl optionally substituted with Het 1 , Het 2 or (C 3 -C 7 )cycloalkyl, wherein said Het 1 , Het 2 and (C 3 -C 7 )cycloalkyl are optionally substituted on a ring carbon atom by one or more substituents each independently selected from (C 1 -C 4 )alkyl, (C 1 -C 4 )alkoxy and halo(C 1 -C 4 )alkyl; each R 2 is independently selected from fluoro, chloro, bromo and iodo; n is 1, 2 or 3; Het 1 is a 5- or 6-membered saturated or partially unsaturated heterocyclic group comprising one or two heteroatom ring members each independently selected from nitrogen, oxygen and sulphur, said ring nitrogen atom optionally bearing a (C 1 -C 4 )alkyl substituent and said ring sulphur atom optionally bearing 1 or 2 oxygen atoms; and Het 2 is a 5- or 6-membered heteroaryl group comprising either (a) from 1 to 4 nitrogen atoms or (b) one oxygen or one sulphur atom and 0, 1 or 2 nitrogen atoms.