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US06887992B2 3-cephem derivative crystal 失效
3-头孢烯衍生物晶体

3-cephem derivative crystal
摘要:
A 3-cephem derivative crystal which is a clathrate compound comprising p-methoxybenzyl ester of 7-phenylacetamide-3-formyl-3-cephem-4-carboxylic acid and dimethylformamide and a process for preparing the 3-cephem derivative crystal.
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