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7beta-amino-3-cephem-3-amino-4-carboxylsyrederivater til anvendelse som mellemprodukter ved fremstilling af 7beta-amino-3-cephem-3-ol-4-carboxylsyreforbindelser
Azetidinderivater til anvendelse som mellemprodukter ved fremstilling af cephalosporansyrederivater og fremgangsmaade til fremstilling af saadanne azetidinderivater