.beta.-Lactam antibiotics are disclosed which have the formula (IA) or pharmaceutically acceptable salts or pharmaceutically acceptable in vivo hydrolyzable esters thereof: ##STR1## wherein R.sub.1 is phenyl, 3-hydroxyphenyl, 4-hydroxyphenyl, 3-aminophenyl, 4-aminophenyl, or 3,4-dihydroxyphenyl, the hydroxy and amino groups being optionally protected, and R is C.sub.1-8 alkyl; and also the use thereof. Processes for the preparation of the compounds are disclosed together with intermediates for use therein.
本文介绍了β-内酰胺类抗生素的结构式(IA)或其药学上可接受的盐或体内可
水解的酯衍
生物:##STR1## 其中R.sub.1是苯基,3-羟基苯基,
4-羟基苯基,3-
氨基苯基,4-
氨基苯基或3,4-二羟基苯基,羟基和
氨基基团可选择性地被保护,R是C.sub.1-8烷基;以及它们的用途。本文还介绍了制备该化合物的过程以及用于其中的中间体。