Cephem derivatives of the general formula ##STR1## in which the R.sub.2 O group is in the syn-position, a process for their manufacture and pharmaceutical formulations which are active against bacterial infections and contain these compounds.
该专利涉及一种通用式为##STR1##中R.sub.2 O基位于同构位的
头孢菌素衍
生物,其制备方法以及含有这些化合物并对抗细菌感染的药物配方。