Patent ID: 7795256

Claim:
A compound of formula (I), or a pharmaceutically acceptable salt thereof: wherein R 1 represents an optionally substituted (C 3-7 cycloalkyl)methyl, or aryl group; R 2 represents hydrogen, nitro, cyano, —CO 2 R a , —CONR b R c , —NR b R c , —NR d COR a , —NR d CO 2 R a , —NR d CONR b R c , —NR d SO 2 R a or —NR d CONHNHSO 2 R a ; R 3 represents an optionally substituted aryl group; wherein the optional substituents on R l and R 3 are selected from the group consisting of halogen, cyano, nitro, C 1-6 alkyl, trifluoromethyl, hydroxy, C 1-6 alkoxy, difluoromethoxy, trifluoromethoxy, C 1-6 alkylsulphonyl, amino, C 1-6 alkylamino, di(C 1-6 ) -alkylamino, aminocarbonyl, and C 2-6 alkoxycarbony; R a represents hydrogens C 1-6 alkyl optionally substituted by amino, C 1-6 alkylamino or di(C 1-6 )alkylamino; or C 3-7 heterocycloalkyl optionally substituted by C 1-6 alkyl; R b represents hydrogens C 1-6 alkyl optionally substituted by hydroxy, amino, C 1-6 alkylamino, di(C 1-6 )alkylamino or C 3-7 heterocycloalkyl; C 2-6 alkenyl; C 3-7 cycloalkyl optionally substituted by amino, C 1-6 alkylamino or di(C 1-6 )alkylamino; or C 3-7 heterocycloalkyl optionally substituted by C 1-6 alkyl; and R c represents hydrogen or C 1-6 alkyl; or R b and R c , when taken together with the nitrogen atom to which they are attached, represent azetidin-1-yl optionally substituted by hydroxy, amino, C 1-6 alkylamino or di(C 1-6 ) alkylamino; pyrrolidin-1-yl optionally substituted by hydroxy, hydroxymethyl, amino, C 1-6 alkylamino or di(C 1-6 )alkylamino; piperidin-1-yl optionally substituted by hydroxy, amino, C 1-6 alkylamino or di(C 1-6 )alkylamino; piperazin-1-yl optionally substituted by C 1-6 alkyl; or morpholin-4-yl; and R d represents hydrogen or C 1-6 alkyl.