.beta.-Lactam antibiotics having an .alpha.-formamido substituent on the carbon atom adjacent to the carbonyl group of the .beta.-lactam ring and in particular bicyclic compounds having the partial structure: ##STR1## Intermediates and processes for the preparation of the compounds are further disclosed.
本发明涉及具有.alpha.-甲酰基取代基的.beta.-内酰胺类抗生素,所述.alpha.-甲酰基取代基位于.beta.-内酰胺环上羰基相邻的碳原子上,特别是具有以下部分结构的
双环化合物:##STR1## 进一步揭示了化合物的中间体和制备过程。