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US5948774A Cephem compounds, their production and use 失效
头孢烯化合物,其生产和使用

Cephem compounds, their production and use
摘要:
Cephem compounds of the formula: ##STR1## wherein R.sup.1 is an optionally protected amino group; R.sup.2 is a fluoro-lower alkyl group; and the ring A may have further substituent(s), or their esters or salts, show broad and excellent antibacterial activities and are useful as antibacterial agents.
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