Olaparib Impurity 33 (CAS 763114-26-7) ist eine strukturell definierte niedermolekulare Prozessverunreinigung im Zusammenhang mit dem pyridazinbasierten PARP-Inhibitor Olaparib. Mit der Summenformel C16H11FN2O3 und einer Molekülmasse von 298,27 g/mol handelt es sich um ein fluoriertes aromatisches Heterozyklusderivat mit Carbonyl- und Heteroatom-Funktionalität, konsistent mit einem Synthesebenprodukt oder Transformationsprodukt aus routenspezifischer Zwischenstufenkupplung oder oxidativem Abbau. Die Bestimmung erfolgt typischerweise mittels LC-MS/MS, hochauflösender Massenspektrometrie und orthogonaler HPLC-UV-Charakterisierung, ergänzt durch NMR zur Strukturabsicherung. Eine klassische genotoxische Warnstruktur liegt nicht vor, dennoch fällt die Bewertung in den Rahmen von ICH Q3A und gegebenenfalls ICH M7.
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