Cefdinir-Lacton, CAS 946573-41-7, ist eine definierte verwandte Substanz von Cefdinir, die durch intramolekulare Lactonisierung und Umlagerung des oximhaltigen Cephalosporin-Gerüsts entsteht. Mit der Summenformel C14H13N5O5S2 und einer Molmasse von 395,41 g/mol handelt es sich um ein strukturell eindeutiges Abbauprodukt und nicht um eine Verunreinigung aus dem Herstellprozess. Seine Bildung ist vor allem unter sauren, thermischen oder hydrolytischen Belastungen relevant, wenn Transformationen des aus dem β-Lactam abgeleiteten Heterocyclus auftreten. Die Bestimmung erfolgt typischerweise mittels LC-MS/MS oder hochauflösender LC-MS, häufig ergänzt durch HPLC-UV zur Trennung und Profilierung.
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