| abstract |
A pharmaceutical composition which composition comprises an effective non-toxic amount of a compound of formula (I), or a tautomeric form thereof and/or a pharmaceutically acceptable salt thereof, and/or a pharmaceutically acceptable solvate thereof, wherein: A1 represents OH or -OSO¿2OH; R?1 represents a hydrogen atom or a C¿1-6? alkyl group; and R?2 and R3¿ each represent hydrogen or R?2 and R3¿ together represent a bond; and a pharmaceutically acceptable carrier therefor; certain novel compounds used in such a composition and the use of such compounds and composition in medicine. |