Cefdinir Related Compound A, CAS 178422-42-9, is a process-related impurity associated with the cephalosporin antibacterials and may arise from incomplete side-chain construction or related synthetic divergence during cefdinir manufacture. With molecular formula C14H15N5O6S2 and molecular weight 413.43 g/mol, it retains the heterobicyclic cephem scaffold and sulfur-containing functionalities characteristic of the parent drug. Its structural proximity to cefdinir necessitates orthogonal identification by LC-MS/MS, high-resolution mass spectrometry, and impurity-resolving HPLC, with NMR confirmation when isolated. Although not a nitrosamine, its presence is regulated as a specified impurity under pharmacopeial and impurity-control frameworks.
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