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Procedimiento para preparar derivados de 1-(p-cloro o p-t-butil-fenoxi o feniltio)-3-(carboxi,etilcarboxi o vinilcarboxi-fenoxi)propanol-2 y sus esteres del acido nicotinico
Procedimiento para obtener compuestos del acido 7-(n-acil)-glicilamino-3-(1-alquil(c1-c4)-1h-tetrazol-5-ilo)-tiometil-1-oxadetia-3-cefem-4-carboxilico y sus sales