N-Nitroso Osimertinib Chloro Impurity is a chlorinated N-nitroso byproduct encountered during synthesis and storage of osimertinib intermediates. It features a nitrosated nitrogen and an alkylaryl chloride motif that influence polarity and mass spectral fragmentation. Formation is commonly associated with residual nitrosating agents and chlorination steps or adventitious chlorine sources. The impurity exhibits distinct retention behavior in reversed phase LC and gives a characteristic [M+H]+ high resolution mass and nitroso-specific IR band. Analytical control relies on sensitive LC-MS/MS or HRMS assays with LOQ in low ppm, targeted purge strategies, and qualification for potential genotoxic risk per current regulatory guidance.
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