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US4876251A Tricyclic penam compounds, their production and their use 失效
三环Penam化合物,其生产和使用

Tricyclic penam compounds, their production and their use
摘要:
The compounds, having a 4,10-dioxo-3-oxa-7-thia-1-azatricyclo[6,2,0,0.sup.2,6 ]decane-2-carboxylic acid skeleton as the base structure, their esters and their salts, are useful antibacterial agents.
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