A compound of the formula; ##STR1## wherein R.sup.1 is an amino group which may be protected, R.sup.3 is a hydrogen atom or an optionally substituted hydrocarbon residue; Z is S, S.fwdarw.O, O or CH.sub.2, R.sup.4 is a hydrogen atom, methoxy group or formamido group, R.sup.13 is a hydrogen atom, methyl group, hydroxyl group or halogen atom and A.sym. is an optionally substituted imidazolium-1-yl group forming a condensed ring at the 2,3- or 3,4-position or a pharmaceutically acceptable salt or ester thereof is novel and has excellent antibacterial activity.
该化合物的式子为:##STR1## 其中R.sup.1是可能被保护的
氨基基团,R.sup.3是氢原子或可选取代的碳氢残基;Z是S,S.fwdarw.O,O或CH.sub.2,R.sup.4是氢原子,甲氧基或甲酰胺基,R.sup.13是氢原子,甲基,羟基或卤素原子,A.sym.是在2,3-或3,4-位置形成紧凑环的可选取代
咪唑-1-基团,或其药学上可接受的盐或酯,是一种新的化合物,具有优异的抗菌活性。