Varenicline Impurity 4 (CAS 950781-94-9) | também referida como Depyrazine 6 ou 6 | 8-dinitrofenil vareniclina | é uma impureza relacionada ao processo que contém um substituinte dinitro aromático; sua presença pode indicar nitratação ou desprendimento do anel pirazínico durante a síntese ou armazenamento. Caracteriza-se por maior polaridade e absorção UV distintiva | sendo detectada e quantificada por HPLC com detecção UV e confirmada por LC-MS e RMN. Do ponto de vista de controle de qualidade e regulação | exige perfil de impurezas | limites especificados conforme ICH e investigação de toxicidade. Estratégias de mitigação incluem otimização de processo | condições de purificação e monitoramento contínuo.
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