Bupropion Related Compound B (HCl salt), CAS 1049718-43-5, is the hydrochloride salt of a brominated bupropion analog with molecular formula C13H18BrNO.HCl and molecular weight 320.65 g/mol. Structurally, it represents a halogenated amphetamine-like ketone impurity associated with synthetic route-related formation or intermediate carryover rather than oxidative degradation. Its ionic character and aromatic bromine substituent influence chromatographic retention and ionization behavior. Trace-level determination typically requires LC-MS/MS, often complemented by LC-UV or high-resolution LC-MS for identity confirmation. In impurity profiling, it is evaluated as a structurally related specified impurity under regulatory specifications and ICH Q3A principles.
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