The compound having the formula:
wherein R is a straight chain, branched chain or cyclic lower alkyl, a lower alkenyl or a lower alkynyl group which may be substituted by a carboxyl group, and R¹ is hydrogen atom or an acetyl group; or a pharmaceutically acceptable salt, physiologically hydrolyzable ester or solvate thereof, processes for the preparation thereof, and an antibacterial agent containing it. Also disclosed are a compound having the formula:
wherein R⁶ is a hydrogen atom or an alkanoyl group, or a salt thereof and a process thereof.
式中 R 为可被羧基取代的直链、支链或环状低级烷基、低级烯基或低级炔基,R¹ 为氢原子或乙酰基的化合物;或其药学上可接受的盐、生理上可
水解的酯或溶液、其制备工艺以及含有该化合物的抗菌剂。 还公开了一种化合物,其式为: 其中 R⁶ 是氢原子或烷酰基,或其盐及其工艺。