Bilastine N-oxide (CAS 2069238-47-5) is the tertiary amine N-oxidation product of bilastine, representing a polar oxidative impurity typically arising during manufacture or storage under peroxide- or oxygen-rich conditions. With molecular formula C28H37N3O4 and molecular weight 479.61 g/mol, it preserves the parent scaffold while increasing heteroatom oxygenation and chromatographic polarity. Its structural assignment generally requires LC-MS/MS with accurate-mass confirmation, often complemented by HILIC or ion-pair reversed-phase HPLC, and can be supported by NMR for definitive elucidation. Although not a nitrosamine, it is relevant to impurity profiling and oxidative degradation assessment under modern regulatory expectations.
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