Losartan EP-Impurity E, CAS 120568-11-8, ist das methylsubstituierte Biphenyl-Tetrazol-Derivat 5-[2-(4-Methylphenyl)phenyl]-2H-tetrazol, auch als Losartan-, Irbesartan- oder Candesartan-Methyl-Impurität bezeichnet. Mit der Summenformel C14H12N4 und einer Molekülmasse von 236,27 g/mol stellt es ein prozessbedingtes Strukturanalogon der biarylischen Tetrazolklasse dar, die in Angiotensin-II-Rezeptorantagonisten vorkommt. Die Verunreinigung kann durch unvollständige Arylierung, methylierte Edukte oder verwandte Synthese-Nebenprodukte entstehen. Für Nachweis und Gehaltsbestimmung werden typischerweise LC-MS/MS, LC-HRMS und orthogonale HPLC-UV-Verfahren benötigt, da die Substanz aromatisch, hydrophob und chromatographisch eng verwandt ist.
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