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US4736039A New cephem compounds and processes for preparation thereof 失效
新的头孢烯化合物及其制备方法

New cephem compounds and processes for preparation thereof
摘要:
This invention relates to novel compounds of the formula: ##STR1## wherein R.sup.1 is carboxy(lower)alkyl or protected carboxy(lower)alkyl, andR.sup.6 is carboxy or protected carboxy, and a slat, thereof, and processes for preparing the same, useful in the preparation of compounds of high antimicrobial activity.
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