Rivaroxaban Impurity 38, CAS 1082588-73-5, corresponds to a low-molecular-weight heteroaromatic impurity with molecular formula C10H12N2O2 and molecular weight 192.21 g/mol. Its composition indicates a small polar scaffold that may arise during synthetic sequence evolution, side-chain cleavage, or oxidative transformation of rivaroxaban-related intermediates rather than as a classical nitrosamine or nitroso derivative. In regulatory assessment, such an impurity is evaluated for structural alerts, potential mutagenic liability, and mass-balance significance. Trace-level characterization typically requires LC-MS/MS with high-resolution MS confirmation, and orthogonal LC-UV or GC-MS methods may be used where volatility and derivatization permit.
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