The present invention provides a compound of formula (I) or a pharmaceutically acceptable salt or in-vivo hydrolysable ester thereof: ##STR1## wherein R.sup.1 is hydrogen or an amino protecting group and R is substituted methyl; optionally substituted C.sub.2-12 alkyl, alkenyl or alkynyl; carbocyclyl; aryl or heterocyclyl. These compounds have antibacterial properties, and therefore are of use in the treatment of bacterial infections in humans and animals caused by a wide range of organisms.
本发明提供了公式(I)的化合物,或其药学上可接受的盐或体内可
水解的酯:##STR1## 其中R.sup.1是氢或
氨基保护基,R是取代的甲基;可选取代的C.sub.2-12烷基,烯基或炔基;碳环基;芳基或杂环基。这些化合物具有抗菌性质,因此可用于治疗由多种
生物引起的人类和动物细菌感染。