A compound having the formula: ##STR1## wherein R is a straight chain or branched chain lower alkyl, cyclic lower alkyl, lower alkenyl (except for 1-carboxy-1-vinyl), lower alkynyl, aralkyl, phenyl or 2-pyrrolidon-3-yl group which may be substituted, and Q is ##STR2## (wherein R.sup.1 is a hydrogen atom or an acetyl group, R.sup.2 is a hydrogen atom, a carboxyl group or a carboxymethyl group, Y is a sulfur atom or an oxygen atom, Z is a sulfur atom, an oxygen atom or an imino group which may be substituted by a lower alkyl group); or a pharmaceutically acceptable salt, physiologically hydrolyzable ester or solvate thereof.
一种化合物的
化学式为:##STR1## 其中R是直链或支链低烷基、环状低烷基、低烯基(除了1-羧基-
1-乙烯基)、低炔基、芳基烷基、苯基或
2-吡咯烷酮-3-基基团,可以被取代,而Q是##STR2##(其中R.sup.1是氢原子或乙酰基,R.sup.2是氢原子、羧基或羧甲基基团,Y是
硫原子或氧原子,Z是
硫原子、氧原子或
亚胺基,可以被低烷基基团取代);或其药学上可接受的盐、生理
水解酯或溶剂化物。