Patent ID: 7888344

Claim:
A pharmaceutical composition comprising a compound of formula (I), or a pharmaceutically acceptable salt thereof: wherein —X— represents a group of formula (a), (b), (c), (d), (e), (f), (g) or (h): R 1 and R 2 independently represent hydrogen; or C 1-6 alkyl, C 3-7 cycloalkyl, C 3-7 cycloalkyl(C 1-6 )alkyl, aryl, aryl(C 1-6 )alkyl, C 3-7 heterocycloalkyl, C 3-7 heterocycloalkyl-(C 1-6 )alkyl, heteroaryl or heteroaryl(C 1-6 )alkyl, any of which groups may be optionally substituted by one or more substituents; or R 1 and R 2 , when both are attached to the same carbon atom, represent, when taken together with the carbon atom to which they are both attached, C 3-7 cycloalkyl or C 3-7 heterocycloalkyl, either of which groups may be optionally substituted by one or more substituents; or R 1 and R 2 , when attached to adjacent carbon atoms, represent, when taken together with the carbon atoms to which they are attached, C 5-7 cycloalkyl, phenyl or heteroaryl, any of which groups may be optionally benzo-fused and/or substituted by one or more substituents; R 3 and R 4 independently represent hydrogen; or C 1-6 alkyl, C 3-7 cycloalkyl, C 3-7 cycloalkyl(C 1-6 )alkyl, aryl, aryl(C 1-6 )alkyl, aryl(C 2-6 )alkenyl, aryl(C 2-6 )alkynyl, biaryl(C 1-6 )alkyl, C 3-7 heterocycloalkyl, C 3-7 heterocycloalkyl(C 1-6 )alkyl, C 3-7 heterocycloalkylcarbonyl, heteroaryl, heteroaryl(C 1-6 )alkyl, heteroaryl-aryl(C 1-6 )alkyl or aryl-heteroaryl(C 1-6 )alkyl, any of which groups may be optionally substituted by one or more substituents; or R 3 and R 4 , when both are attached to the same carbon atom, represent, when taken together with the carbon atom to which they are both attached, C 3-7 cycloalkyl or C 3-7 heterocycloalkyl, either of which groups may be optionally substituted by one or more substituents; or R 3 and R 4 , when attached to adjacent carbon atoms, represent, when taken together with the carbon atoms to which they are attached, C 5-7 cycloalkyl, phenyl or heteroaryl, any of which groups may be optionally benzo-fused and/or substituted by one or more substituents; and R 5 and R 6 independently represent hydrogen or C 1-6 alkyl, together with a pharmaceutically acceptable carrier.