Compounds represented by the following formula ##EQU1## wherein A is a substituted or unsubstituted heterocyclic radical and T is a C.sub.2 -C.sub.5 alkyl, alkenyl, cyclopropylmethyl, cyclobutylmethyl or cyclopentyl group A process for their preparation and novel intermediates therefor are disclosed. These compounds are useful antibiotics.
本发明涉及一种用以下式表示的化合物 ##EQU1## 其中A是取代或未取代的杂环基团,T是C.sub.2-C.sub.5烷基,烯基,环丙甲基,
环丁基甲基或环戊基基团。本发明还涉及制备它们的新中间体和有用的抗生素化合物的制备方法。