Acalabrutinib N-Oxide is a defined oxidative process-related impurity of the BTK inhibitor acalabrutinib, arising primarily from tertiary amine N-oxidation during synthesis, storage, or exposure to peroxides and other reactive oxygen species. With molecular formula C26H23N7O3 and molecular weight 481.52 g/mol, the species exhibits altered polarity and chromatographic behavior relative to the parent drug, often requiring LC-MS/MS, high-resolution mass spectrometry, and orthogonal HPLC methods for unambiguous characterization and quantification. Although not a nitrosamine, its presence is evaluated within impurity control strategies under ICH Q3A/Q3B and related degradant profiling frameworks.
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