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Publication of CS117884A2publicationCriticalpatent/CS117884A2/cs
Publication of CS255857B2publicationCriticalpatent/CS255857B2/cs
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.