Cephalosporin antibiotics of general formula ##STR1## (wherein R.sup.1 represents a hydrogen atom or a methyl or 2-chloroethyl group) and non-toxic salts and non-toxic metabolically labile esters thereof. The compounds exhibit broad spectrum antibiotic activity and have high activity against both Gram-positive and Gram-negative organisms, including many .beta.-lactamase producing strains. Processes for the preparation of the compounds and pharmaceutical compositions containing them are described.
通式为## STR1##(其中R.sup.1代表氢原子或甲基或2-
氯乙基基团)的
头孢菌素类抗生素及其非毒性盐和非毒性代谢易降解酯。这些化合物展示了广谱抗生素活性,并且对革兰氏阳性和革兰氏阴性菌,包括许多β-内酰胺酶产生菌株具有高活性。本文描述了制备这些化合物的方法和含有它们的制药组合物。