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Priority claimed from US06/563,841external-prioritypatent/US4562210A/en
Application filed by Ciba Geigy AgfiledCriticalCiba Geigy Ag
Publication of PH20321ApublicationCriticalpatent/PH20321A/en
Procedimiento para preparar derivados del acido 7beta-(carboxialquenoilamino)-(1-o,1-5 o 1-50)-3 cefem-4- carboxilico, y los intermediarios de aplicacion exclusiva en dicho procedimiento.