Bupropion Related Compound E, also designated Bupropion Dione Derivative, CAS 10557-17-2, is a low-molecular-weight chlorinated carbonyl impurity with formula C9H7ClO2 and molecular weight 182.6 g/mol. Structurally, it represents an oxidized aryl ketone motif consistent with a synthetic intermediate or over-oxidation product arising during preparation of bupropion-related scaffolds. Its electrophilic carbonyl functionality and aryl chloride substitution require characterization by LC-MS/MS and, where volatility or derivatization permits, GC-MS, with confirmatory NMR for structural assignment. In impurity profiling, such species are evaluated for process-related origin and potential relevance to ICH M7 control strategies when present at trace levels.
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