3-Chlorobenzoic acid, CAS 535-80-8, is a halogenated aromatic carboxylic acid of formula C7H5ClO2 and molecular weight 156.57 g/mol. In bupropion-related impurity profiling, it is structurally distinct from the active substance and is more consistent with an auxiliary synthetic residue or reagent-derived aromatic acid than with a reactive genotoxic species. Its planar chlorobenzoate scaffold confers moderate hydrophobicity and acid dissociation behavior relevant to chromatographic retention. Trace determination commonly relies on LC-MS/MS, GC-MS after derivatization, or HPLC with UV detection, particularly when resolving low-level aromatic acids in complex matrices.
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