Regorafenib EP Impurity A, also designated Regorafenib Related Compound A, is identified by CAS 757251-39-1 and has the molecular formula C13H12FN3O2 with molecular weight 261.26 g/mol. The structure represents a defined synthetic intermediate or process-related impurity associated with the construction of the substituted fluorinated heteroaryl motif present in regorafenib. Such species are typically monitored under impurity profiling schemes because their presence may reflect incomplete conversion, side reactions, or precursor carryover. Determination generally requires orthogonal high-resolution LC-MS, LC-MS/MS, and impurity-specific HPLC with UV detection, with structural confirmation by NMR when necessary.
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