Rivaroxaban Impurity 70, CAS 89166-94-9, corresponds to C5H2Cl2O2S with a molecular weight of 197.03 g/mol. The structure is consistent with a chlorinated sulfur-containing aromatic fragment, structurally related to thienyl or acyl chloride derived intermediates that may arise from incomplete coupling, side-chain truncation, or oxidative fragmentation during process synthesis. Because such low-molecular-weight halogenated impurities can exhibit distinct polarity and volatility, their characterization often requires orthogonal LC-MS/MS and GC-MS, with high-resolution mass spectrometry supporting elemental assignment. In a regulatory setting, its presence is assessed as a process-related impurity and potential genotoxic concern where relevant structure-activity evidence exists.
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