Tegoprazan R-Isomer, CAS 942195-56-4, is the enantiomeric impurity associated with the potassium-competitive acid blocker tegoprazan. With molecular formula C20H19F2N3O3 and molecular weight 387.4 g/mol, it represents stereochemical nonconformity rather than a structural degradant. Such isomeric impurity can arise from asymmetric synthesis, epimerization at a chiral precursor, or incomplete enantiomeric resolution during manufacture. Regulatory assessment typically focuses on enantiomeric purity, because pharmacological divergence between isomers may affect potency and exposure. Determination commonly requires chiral LC methods, often complemented by LC-MS/MS for trace profiling and quantitative confirmation.
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