| abstract |
A compound of ** formula ** or stereoisomers or salts thereof acceptable for pharmaceutical use, where: b is a single bond; X is ¿CHR10¿ or ¿C (= O) ¿; R 1 is selected from H, C (= O) R 2, C (= O) OR 2, C 1-8 alkyl, C 2-8 alkenyl, C 2-8 alkynyl, C 3-7 cycloalkyl, C 1-6 alkyl substituted with Z, C 2 alkenyl 6 substituted with Z, C2-6 alkynyl substituted with Z, C3-6 cycloalkyl substituted with Z, aryl substituted with Z, 5-6 membered heterocyclic ring system containing at least one heteroatom selected from the group consisting of N, O , and S, said Z-substituted heterocyclic ring system. |