Bupropion 3,5-Dichloro Impurity, also designated 5-Chloro Bupropion, is a halogenated process-related impurity associated with bupropion hydrochloride manufacture and aryl chlorination pathways rather than a distinct pharmacological class. The compound, CAS 1193779-48-4, has molecular formula C13H17Cl2NO and molecular weight 274.19 g/mol. Its chlorinated aromatic motif increases chromatographic retention and alters mass spectral fragmentation, necessitating LC-MS/MS or high-resolution LC-MS for trace-level characterization, with orthogonal confirmation by HPLC-UV or GC-MS where volatility permits. From a regulatory perspective, such structurally defined impurities are assessed under ICH impurity and potential mutagenic risk frameworks.
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