发明授权
US4985555A Cephem compounds 失效
头孢烯化合物

Cephem compounds
摘要:
The invention relates to a cephem compound of high antimicrobial activity of the formula: ##STR1## wherein R.sup.1 is amino, R.sup.2 is hydrogen, phenyl, pyridyl which may have a lower alkyl group, or cyano, and R.sup.3 is carboxy or protected carboxy, or a salt thereof.
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