Hyoscine Butylbromide EP Impurity D, também denominada Hyoscine Propyl Impurity, é um análogo estrutural definido do esqueleto tropânico éster antimuscarínico, compatível com homologia alquila na cadeia de amônio quaternário. Com fórmula molecular C20H28NO4 e massa molecular de 346.45 g/mol, é geralmente interpretada como impureza relacionada ao processo, resultante de alquilação ou de transferência catiônica incompleta durante a síntese do derivado butilbrometo. Sua identificação requer LC-MS/MS e LC-HRMS de alta resolução, com confirmação por RMN quando a elucidação estrutural é necessária. Por não ser uma nitrosamina, não se enquadra nos alertas genotóxicos da ICH M7, embora permaneça relevante para o perfil de impurezas e o controle farmacopeico.
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