2-(3-(4-((1H-Indazol-5-yl)amino)quinazolin-2-yl)phenoxy)acetic acid (CAS 911417-62-4) is a structurally related process impurity characterized by a quinazolinyl core linked to an indazolyl amine and a terminal carboxylic acid. Its polyaromatic heterocyclic framework produces strong UV chromophores and moderate lipophilicity while the acetic acid moiety confers acidic ionization that alters retention in reversed-phase LC and HPLC. Typical identification and quantification employ LC-UV, LC-MS and 1H/13C NMR with diagnostic mass fragments from the indazole and quinazoline subunits. Routine monitoring is advised because this impurity can affect API purity, stability and formulation performance.
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