Patent ID: 7888503

Claim:
A compound of Formula (I): wherein the dotted line represents a bond or is absent; R 1 represents pyrazolyl, pyridinyl, pyrimidinyl optionally substituted by NH 2 , or indazolyl; R 2 represents phenyl optionally substituted by one or more substituents selected from C 1-6 alkyl, CN, C 1-6 alkoxy, C 1-6 haloalkyl, C 1-6 haloalkoxy, NO 2 , halogen; or a 5-membered heteroaryl group containing one or more heteroatoms selected from O, N or S optionally substituted by a 5-membered heteroaryl group; R 3 and R 4 independently represent H or C 1-6 alkyl; or a salt thereof.