A Bupropion 3,4-Dichloro Impurity (CAS 1346598-72-8) é uma impureza halogenada relacionada ao processo sintético da bupropiona, plausivelmente gerada por arraste de precursores aromáticos clorados ou por vias de reação secundárias durante a preparação de intermediários. Com fórmula molecular C13H18Cl3NO e massa molecular de 310.65 g/mol, trata-se de um análogo estrutural e não de um simples produto de degradação. A substituição triclorada aumenta a hidrofobicidade cromatográfica e pode alterar a ionização, exigindo tipicamente LC-MS/MS, LC-MS de alta resolução e, quando a derivatização volátil for viável, GC-MS. A avaliação regulatória é conduzida sob ICH Q3A/Q3B, com qualificação toxicológica baseada em limites de aceitação.
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