Estriol Related Compound A; 9, 11-didehydroestriol; (8S,13S,14S,16R,17R)-13-methyl-7,8,12,13,14,15,16,17-octahydro-6H-cyclopenta[a]phenanthrene-3,16,17-triol
Beschreibung
Estriol EP Impurity A, auch als Estriol Related Compound A und 9,11-Didehydroestriol bezeichnet, ist ein oxygeniertes steroidales Abbauprodukt, das mit Estriol unter oxidativem und dehydratisierendem Stress in Verbindung steht. Diese ungesättigte estrogenartige Verunreinigung mit der CAS-Nummer 246021-20-5 besitzt die Summenformel C18H22O3 und eine Molmasse von 286.37 g/mol. Der Sättigungsverlust im Bereich C9-C11 verändert das konjugierte Steroidgerüst und kann Polarität sowie UV-Antwort beeinflussen. Die Spurenbestimmung erfordert üblicherweise eine orthogonale Trennung mittels HPLC oder UHPLC in Kombination mit LC-MS/MS und, falls erforderlich, hochauflösende MS zur Bestätigung. Der Stoff ist für das Verunreinigungsprofil und die Stabilitätsbewertung estriolhaltiger Materialien relevant.
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