A impureza 3-metil de cefdinir, CAS 71091-93-5, é uma substância relacionada de origem processual do antibiótico cefdinir, cefalosporina de terceira geração, com fórmula molecular C13H13N5O5S2 e massa molecular de 383,40 g/mol. Estruturalmente, trata-se de um análogo metilado, geralmente formado por reação secundária de síntese ou por controle incompleto de etapas de alquilação durante a fabricação, e não por degradação clássica. Como impureza associada ao núcleo β-lactâmico, sua identificação e quantificação exigem LC-MS/MS, LC-MS de alta resolução e métodos ortogonais por HPLC-UV, no contexto de ICH Q3A e dos controles farmacopeicos aplicáveis.
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