Thioctic Acid EP Impurity A (CAS 1204245-29-3) é uma substância relacionada rica em enxofre da química do ácido lipoico, compatível com um produto de transformação oxidativa ou de processo, e não com um contaminante inespecífico. Com fórmula molecular C8H14O2S3 e massa molecular de 238.4 g/mol, apresenta um motivo tritiolânico relacionado a dissulfeto que pode alterar o comportamento redox e a resposta cromatográfica. Sua atribuição estrutural e quantificação geralmente exigem LC-MS/MS, LC-MS de alta resolução e, quando a volatilidade permite, GC-MS. No contexto farmacopéico, essa espécie é tratada como degradante definido ou subproduto associado à síntese dentro do perfil de impurezas.
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