N-Nitroso Darolutamide Amine Impurity is a nitrosamine-related degradant formed by nitrosation of darolutamide's amine moiety, raising genotoxicity and regulatory concern. Chemically characterized by an N-nitroso functional group, the impurity can arise during synthesis, purification or storage when nitrosating agents, nitrites or acidic conditions are present. Analytical control relies on sensitive LC-MS/MS and GC-MS methods with sample enrichment, stable isotope dilution and validated limits of detection. Risk mitigation includes raw material screening, control of nitrite levels, pH management, scavengers and optimized workup, coupled with forced degradation studies and stability testing to support specification setting and batch release decisions.
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