The invention provides novel antibiotic compounds which are 6.beta.-acylamidopenam-3-carboxylic acids, and nontoxic derivatives thereof, characterized in that the acylamido group has the structure ##EQU1## WHERE R is a hydrogen atom or an organic group and R.sup.a is an etherifying monovalent organic group linked to the oxygen atom through a carbon atom. The compounds may be either syn or anti isomers or may exist as mixtures e.g. containing at least 75% of one isomer. These antibiotic compounds possess high antibacterial activity against a range of gram positive organisms including penicillinase - producing staphylococci coupled with high activity against strains of the gram-negative organism Haemophilus influenzae. The invention is also concerned with the administration of the compounds.
本发明提供了新型抗生素化合物,它们是6-β-酰胺基青霉烯-3-
羧酸及其非毒性衍
生物,其特征在于酰胺基具有以下结构:##EQU1## 其中R是氢原子或有机基团,R.sup.a是通过碳原子与氧原子连接的醚化一价有机基团。这些化合物可以是syn或anti异构体,也可以存在于混合物中,例如至少含有75%的一个异构体。这些抗生素化合物对包括产
青霉素酶的葡萄球菌在内的一系列革兰氏阳性菌株具有高抗菌活性,并且对流感嗜血杆菌的菌株也具有高活性。本发明还涉及这些化合物的给药。