Cefdinir-7-Epimer (CAS 178601-89-3) ist eine stereochemische Verunreinigung der Cephalosporin-Klasse, die durch Epimerisierung an der 7-Position der Oxyimin-Seitenkette entsteht, meist während der Synthese oder unter sauren, basischen oder thermischen Belastungen. Die Verbindung besitzt die Summenformel C14H13N5O5S2 und eine Molmasse von 395,41 g/mol. Da es sich um eine Konfigurationsänderung und nicht um eine neue Zusammensetzung handelt, wird sie als verwandte Substanz mit orthogonaler Charakterisierung betrachtet. Für Nachweis und Gehaltsbestimmung werden üblicherweise RP-LC-MS, LC-MS/MS sowie chirale oder hochauflösende chromatographische Verfahren eingesetzt; alleinige UV-Detektion ist häufig nicht ausreichend.
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