Buspiron-EP-Verunreinigung H, auch als Buspiron-Diester-Dimer bezeichnet, ist eine prozessbezogene dimerische Verunreinigung, die mit der Esterchemie von Buspiron assoziiert ist und aus intermolekularer Kondensation oder Transesterifizierung während Synthese und Isolierung entstehen kann. Mit CAS 2708578-34-9, der Summenformel C33H50N8O4 und einer Molekülmasse von 622.80 g/mol handelt es sich um ein nichtflüchtiges, strukturell symmetrisches Nebenprodukt und nicht um eine reaktive Stoffklasse wie Nitrosamine. Aufgrund der Polarität und der engen strukturellen Verwandtschaft zum Wirkstoff erfordert der Spurenachweis typischerweise RP-LC gekoppelt mit hochauflösender MS oder LC-MS/MS; eine UV-Bestätigung ist häufig nicht hinreichend eindeutig.
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