O análogo isoxazol de cefdinir, CAS 1356842-10-8, é uma impureza de processo estruturalmente relacionada à cefalosporina de terceira geração cefdinir, na qual a cadeia lateral heterocíclica é representada por um análogo contendo isoxazol. Com fórmula molecular C13H11N3O6S e massa molecular de 337.31 g/mol, reflete uma modificação do motivo oxima-arila com preservação do núcleo β-lactâmico. Espécies desse tipo costumam surgir por arraste de intermediários de síntese ou por reações paralelas durante a montagem do heterociclo. Sua detecção e quantificação em níveis traço geralmente exigem LC-MS/MS, espectrometria de massas de alta resolução e RP-HPLC ortogonal, no contexto de controle farmacopéico de impurezas e das expectativas regulatórias da ICH.
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