| 摘要 |
CEPHALOSPORIN ANALOGUES Potent antibacterial cephalosporin analogues of the formula: (wherein A and B are each hydrogen or an amino-protecting group; X is hydroxy or a carboxy-protecting group; and Y is hydrogen or methoxy; provided that when A is hydrogen B cannot be hydrogen or phenylglycyl) new process for preparing them for penicillins through azetidinone derivatives, and bactericidal compositions for pharmaceutical and veterinary use. |
