New cephalosporins of the general formula: ##STR1## in which R is alkyl, L-2-amino-2-carboxyethyl, phenyl or various heterocyclic rings, R' is a hydrogen atom or a radical of the general formula: ##STR2## and R.degree. is hydrogen, alkyl, vinyl, cyanomethyl or a carboxyalkyl radical of the general formula: ##STR3## and also their salts, their preparation and the pharmaceutical compositions in which they are present.
通用公式为:##STR1## 其中 R 是烷基,
L-2-
氨基-2-羧乙基,苯或各种杂环环;R' 是氢原子或通用公式的基团:##STR2## 而 R.degree. 是氢、烷基、
乙烯基、
氰甲基或通用公式的羧基烷基基团:##STR3## 以及它们的盐、它们的制备以及它们所在的药物组合物。