Cefdinir Thiazine Analog, CAS 178422-39-4, is a process-related heterocyclic impurity associated with cefdinir chemistry, plausibly arising from cyclization, sulfur oxidation state rearrangement, or other late-stage synthetic divergence within the cephalosporin framework. With molecular formula C14H15N5O6S2 and molecular weight 413.43 g/mol, it retains the beta-lactam derived heteroatom pattern yet differs in ring topology and substitution, which can alter chromatographic behavior and UV response. Characterization typically requires LC-MS/MS, high-resolution LC-MS, and orthogonal LC-UV methods, with impurity profiling guided by ICH impurity and mutagenic risk assessment principles when structural alerts are evaluated.
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