发明授权
US4723004A Cephem compounds 失效
头孢烯化合物

Cephem compounds
摘要:
A compound of the formula: ##STR1## wherein R.sup.1 is ##STR2## HOOC--(CH.sub.2).sub.3 --CO-- or hydrogen, or a salt thereof, is useful as an intermediate for the production of cephem compounds, and some of them are useful as antimicrobial agents.
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