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.
本发明提供了一种化合物,其
化学式为(I)或其药用可接受的盐或体内可
水解酯:其中R.sup.1为氢或
氨基保护基,R为取代甲基;可选择取代的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能,因此可用于治疗人类和动物因多种微
生物引起的细菌感染。