Bilastine Impurity 17, CAS 202189-83-1, é uma substância relacionada definida, de origem de processo ou degradação, associada à bilastina, um antagonista H1 da histamina derivado de piperidina. Com fórmula molecular C26H33N3O3 e massa molecular de 435,57 g/mol, corresponde a um análogo oxigenado e lipofilicamente substituído, cuja elucidação estrutural geralmente requer LC-MS/MS e espectrometria de massa de alta resolução, frequentemente complementadas por RMN para atribuição posicional. Sua formação é atribuída a reações secundárias de síntese ou a transformações oxidativas do esqueleto parental. No contexto regulatório de impurezas, tais espécies são avaliadas segundo ICH Q3A/Q3B, com quantificação por LC-UV e métodos baseados em MS.
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