Tricyclic cepham compounds, their production and use
申请人:Takeda Chemical Industries, Ltd.
公开号:EP0253337A2
公开(公告)日:1988-01-20
The compounds having a 4,11-dioxo-3-oxa8(or 7)-thia-1- azatricyclo[7,2,0,02,6]undecane-2-carboxylic acid skeleton as the base structure, their esters and their salts are useful antibacterial agents.