Prucalopride Impurity 26 ist eine definierte, prozessbezogene Begleitverbindung des Synthese- und Abbauprofils von Prucalopride, einem substituierten Dihydrobenzofuran-Derivat mit bromiertem Aromaten und basischer tertiärer Aminfunktion. Mit der Summenformel C18H26BrN3O3 und einer Molmasse von 412,33 g/mol ist diese Verunreinigung eher als komplexes heteroaromatisches Nebenprodukt denn als einfaches Hydrolyseprodukt einzuordnen. Ihre Entstehung kann auf unvollständige Ringschlussreaktionen, Alkylierungsfehler oder stereochemische Divergenzen während der Herstellung zurückgehen. Die Charakterisierung stützt sich typischerweise auf LC-MS/MS, hochauflösende Massenspektrometrie und orthogonale HPLC-Verfahren, ergänzt durch NMR. Die regulatorische Bewertung erfolgt im Rahmen von ICH Q3A/Q3B und, bei strukturellen Warnhinweisen, nach ICH M7.
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