Compounds of formula (I) and pharmaceutically acceptable salts and in-vivo hydrolysable esters thereof: ##STR1## wherein X is hydrogen or a group NHR.sup.1, wherein R.sup.1 is hydrogen or an amino protecting group, and R is an optionally substituted 5-membered or 6-membered saturated heterocyclic group containing 1 or 2 heteroatoms selected from oxygen, sulphur or nitrogen, are useful in the treatment of bacterial infections in humans and animals.
公式(I)的化合物及其药用可接受盐和体内可
水解酯:其中X为氢或基团NHR.sup.1,其中R.sup.1为氢或
氨基保护基,R为含有1或2个来自氧、
硫或氮的杂原子的可选取代的5-或6-成员饱和杂环基团,在人类和动物的细菌感染治疗中有用。