El análogo tiazínico de cefdinir, CAS 178422-39-4, es una impureza heterocíclica relacionada con el proceso de síntesis de cefdinir, presumiblemente originada por ciclación, reorganización del estado de oxidación del azufre u otras desviaciones tardías de la ruta sintética dentro del esqueleto cefalosporínico. Con fórmula molecular C14H15N5O6S2 y peso molecular de 413.43 g/mol, conserva el patrón de heteroátomos derivado del beta lactámico, pero presenta diferencias en topología de anillo y sustitución que modifican el comportamiento cromatográfico y la respuesta UV. Su caracterización suele requerir LC-MS/MS, LC-MS de alta resolución y métodos ortogonales LC-UV, bajo criterios ICH para impurezas y evaluación de riesgo mutagénico.
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