Acalabrutinib Nitroso Impurity 2 ((S)-4-(8-amino-3-(1-nitrosopyrrolidin-2-yl)imidazo[1,5-a]pyrazin-1-yl)benzoic acid) is a nitroso-bearing degradation product characterized by a nitrosopyrrolidinyl moiety adjacent to an imidazo[1,5-a]pyrazine core and a benzoic acid terminus, features that affect polarity, retention behavior and stereochemical complexity. Accurate detection and quantification are achieved using LC-MS, HPLC-UV and NMR fingerprinting for impurity profiling and stability studies. The presence of a nitroso functional group necessitates genotoxicity-focused risk evaluation and conservative specification limits. Comprehensive knowledge of formation pathways and targeted analytical controls supports impurity monitoring, specification setting and regulatory compliance within pharmaceutical quality systems.
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