La impureza 3-metilo de cefdinir, CAS 71091-93-5, es una sustancia relacionada de origen de proceso del antibiótico cefdinir, cefalosporina de tercera generación, con fórmula molecular C13H13N5O5S2 y peso molecular de 383,40 g/mol. Estructuralmente corresponde a un análogo metilado que suele originarse por una reacción secundaria de síntesis o por control insuficiente de etapas de alquilación durante la fabricación, más que por degradación clásica. Como impureza asociada al núcleo β-lactámico, su identificación y cuantificación suelen requerir LC-MS/MS, LC-MS de alta resolución y métodos HPLC-UV ortogonales, dentro del marco de ICH Q3A y los controles farmacopeicos aplicables.
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