El análogo isoxazol de cefdinir, CAS 1356842-10-8, es una impureza de proceso estructuralmente relacionada con la cefalosporina de tercera generación cefdinir, en la que la cadena lateral heterocíclica está representada por un análogo con isoxazol. Con fórmula molecular C13H11N3O6S y peso molecular de 337.31 g/mol, corresponde a una modificación del motivo oxima-arilo con conservación del núcleo β-lactámico. Estas especies suelen originarse por arrastre de intermedios de síntesis o por reacciones secundarias durante el ensamblaje del heterociclo. Su detección y cuantificación a nivel traza requieren normalmente LC-MS/MS, espectrometría de masas de alta resolución y RP-HPLC ortogonal, dentro de los marcos de control de impurezas farmacopéico e ICH.
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