| abstract |
A compound of formula (I): ** Formula ** in which the dotted line represents a bond or the bond is absent; R1 represents pyrazolyl, pyridinyl optionally substituted with halo, pyrimidinyl optionally substituted with NH2 or indazolyl; R2 represents phenyl optionally substituted with one or more substituents selected from C1-6 alkyl, CN, C1-6 alkoxy, C1-6 haloalkyl, C1-5 haloalkoxy, NO2 and halogen; or a 5-membered heteroaryl group containing one or more heteroatoms selected from O, N, or S optionally substituted with a 5-membered heteroaryl group; R3 and R4 independently represent H or C1-6 alkyl; or a salt, or a solvate thereof. |