Telmisartan EP Impurity B, auch als Telmisartan Related Compound B oder Telmisartan-Isomer bezeichnet, ist ein Strukturisomer des Biphenyl-Tetrazol-Angiotensin-II-Rezeptorantagonisten. Die CAS-Nummer 1026353-20-7 gehört zu einem neutralen, nichtklassischen isomeren Verunreinigungsbestandteil mit der Summenformel C33H30N4O2 und einem Molekulargewicht von 514,62 g/mol. Sein Auftreten wird typischerweise mit Isomerisierung im Syntheseweg oder einer späten Umlagerung und nicht mit oxidativem Abbau verknüpft. Da Stellungsisomere mit dem Wirkstoff koeluieren können, stützt sich die Identifizierung meist auf LC-MS/MS, hochauflösende LC-MS und orthogonale chromatographische Trennung, ergänzt durch NMR-Bestätigung. Es wird als prozessbedingte Verunreinigung nach pharmakopöischen Vorgaben überwacht.
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