Patent ID: 7582624

Claim:
A compound of formula (Ic), or a pharmaceutically acceptable salt thereof, wherein: R 1 is phenyl; R 3 is methyl or chlorine; n is 0 or 1; R 4 is hydrogen or methyl; R 5 ′ is —X′; X′ is —CONR′R″ and each R′ R″ is the same or different and represents hydrogen, C 1-4 alkyl, phenyl, thienyl, cyclohexyl, cyclopentyl or phenyl-(CH 2 )—; wherein: the phenyl moiety in the group R 1 being unsubstituted or substituted by a single C 1-2 alkyl, C 1-2 alkoxy, C 1-2 alkylthio, C 1-2 haloalkyl or C 1-2 haloalkoxy substituent; the phenyl, thienyl, cyclohexyl, cyclopentyl or phenyl-(CH 2 )— moieties in the R′ and R″ being unsubstituted or substituted by one or two substituents selected from fluorine, chlorine, bromine, and nitro.