Hyoscin-Butylbromid EP Impurity D, auch als Hyoscin-Propyl-Impurität bezeichnet, ist ein definierter struktureller Analogon des tropanischen Ester-Antimuskarinika-Gerüsts und entspricht einer Alkylhomologisierung der quartären Ammoniumseitenkette. Mit der Summenformel C20H28NO4 und einer Molekülmasse von 346,45 g/mol wird sie im Allgemeinen als prozessbedingte Verunreinigung interpretiert, die aus Alkylierung oder unvollständigem kationischem Kettenaufbau während der Synthese des Butylbromid-Derivats entsteht. Die Identifizierung erfordert LC-MS/MS und hochauflösende LC-HRMS, gegebenenfalls ergänzt durch NMR. Als Nicht-Nitrosamin fällt sie nicht unter ICH-M7-genotoxische Warnhinweise, bleibt jedoch für Impuritätsprofil und pharmakopöische Grenzwertsetzung relevant.
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