Bromfenac (indol-indol) Dimer, CAS 2469279-10-3, is a brominated dimeric process-related impurity associated with the arylacetic acid NSAID bromfenac. Its composition, C30H18Br2N2O4, molecular weight 630.3 g/mol, indicates oxidative C-C coupling of two indole-derived fragments during synthesis or storage, rather than simple hydrolysis or isomerization. The conjugated, high-mass structure may exhibit low volatility and strong chromatographic retention, requiring LC-MS/MS, high-resolution LC-MS, and often UV or photodiode array detection for assignment. In a regulatory context, this type of impurity is evaluated as a structurally related organic impurity, with attention to genotoxicity assessment when impurity-specific toxicology is unavailable.
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