发明授权
US5079369A Syn-isomer of 3,7-disubstituted-3-cephem-4-carboxylic acid compounds and processes for the preparation thereof 失效
3,7-取代-3-羧基-4-羧酸化合物的同位素及其制备方法

Syn-isomer of 3,7-disubstituted-3-cephem-4-carboxylic acid compounds and
processes for the preparation thereof
摘要:
The compound of the formula: ##STR1## wherein R.sup.2 is carboxy(lower)alkyl or protected carboxy(lower)alkyl, and R.sup.6 is amino or protected amino, or its reactive derivative at the carboxy group effective for transforming the carboxy group into a reactive N-acylating group, or a salt thereof.
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