Bromfenac Impurity 5, also designated WAY 127039-A-1 sodium salt, is an aromatic brominated benzoic acid derivative with formula C15H9BrNNaO4 and molecular weight 370.13 g/mol, CAS 1391052-54-2. Structurally, it represents an ionic impurity related to bromfenac chemistry, plausibly arising from salt formation or synthetic divergence during acylation and heteroaryl coupling steps. Its presence is relevant to impurity profiling because brominated species may persist through crystallization and can affect related-substance limits. Characterization typically relies on LC-MS/MS, high-resolution LC-MS, and NMR confirmation, with UV detection alone often insufficient for definitive assignment.
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