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Priority claimed from CS206270Aexternal-prioritypatent/CS191155B2/en
Application filed by Charles F Murphy, John A WebberfiledCriticalCharles F Murphy
Priority to CS75210ApriorityCriticalpatent/CS191166B2/en
Publication of CS191166B2publicationCriticalpatent/CS191166B2/en
Process for producing 7-beta-acylamido-3-methyl-cef-3-em-4-carboxylic acids and its esters from 6-beta acylamido-penam-3-carboxylic acid-1-oxide-esters