Cefdinir 7-Epimer (CAS 178601-89-3) is a stereochemical impurity of the cephalosporin class arising from epimerization at the 7-position of the oxyimino side chain, typically during synthesis or under acidic, basic, or thermal stress. Its molecular formula is C14H13N5O5S2 with a molecular weight of 395.41 g/mol. Because the change is configurational rather than compositional, it is not a separate degradant class but a related substance requiring orthogonal characterization. Identification and assay generally rely on reversed-phase LC-MS, LC-MS/MS, and chiral or high-resolution chromatographic methods, with UV detection alone often insufficient for definitive assignment.
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