2-[2-[9,10-dimetoxi-4-oxo-2-(2,4,6-trimetilfenil)imino-6,7-diidropirimido[6,1-a]isoquinolin-3-il]etil]isoindol-1,3-diona (CAS 3046226-90-5) é uma impureza heteroaromática ligada a uma fração ftalimídica, com fórmula molecular C33H32N4O5 e massa molecular de 564,642 g/mol. A estrutura sugere formação em etapa tardia de acoplamento ou de derivatização da cadeia lateral, com persistência favorecida pela estabilidade aromática e pela baixa susceptibilidade à hidrólise do motivo imida. O sistema fundido estendido e o fragmento anilídico trisubstituído podem dificultar a resolução cromatográfica frente a intermediários de processo correlatos. A determinação em níveis traço normalmente requer LC-MS/MS com confirmação por alta resolução e massa exata, além de perfis ortogonais por LC-UV ou LC-CAD. Como heterociclo estruturalmente relacionado, é avaliada em estruturas regulatórias de controle de impurezas, incluindo ICH M7 quando aplicável.
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