Prucalopride Succinate Impurity – 4, auch bezeichnet als Prucalopride-N-Oxide oder Prucalopride Impurity C, ist eine definierte oxidative Verunreinigung im synthetischen Profil und in der Handhabung von Prucalopride. Mit CAS 1900715-98-1, Formel C18H26ClN3O4 und Molekulargewicht 383,87 g/mol entspricht sie der N-Oxidation des pyridinähnlichen heteroaromatischen Stickstoffs im Wirkstoffgerüst. Die Entstehung ist vereinbar mit Luftoxidation, peroxidativem Stress oder Verschleppung während der Herstellung. Da N-Oxide die Polarität und chromatographische Retention verändern, sind für Identifizierung und Quantifizierung typischerweise LC-MS/MS, hochauflösende LC-MS und gegebenenfalls NMR erforderlich.
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