A compound having the formula:
wherein R' is a straight chain, branched chain or cyclic lower alkyl group which may be substituted by a carboxyl group, and each of R2 and R3 which may be the same or different, is a hydrogen atom, a hydroxyl group, a methoxy group or an acetoxy group, and R4 is a hydroxyl group, a methoxy group or an acetoxy group; or a pharmaceutically acceptable salt, physiologically hydrolyzable ester or solvate thereof.
一种化合物,其式如下: 其中 R' 是可被羧基取代的直链、支链或环状低级烷基,R2 和 R3 可相同或不同,各自是氢原子、羟基、甲氧基或乙酰氧基,R4 是羟基、甲氧基或乙酰氧基;或其药学上可接受的盐、生理上可
水解的酯或溶液。