Seladelpar S-Sulfoxide is the sulfoxide oxidation product of seladelpar, formally designated as an oxidative process impurity and potential degradation marker rather than a distinct pharmacophore. With molecular formula C21H23F3O6S and molecular weight 460.46 g/mol, it contains a stereogenic sulfur center that may exist as configurationally relevant sulfoxide isomers. Formation is typically associated with peroxide-mediated oxidation during synthesis, storage, or sample handling. Characterization and assay generally require LC-MS/MS with high-resolution mass spectrometry, often complemented by HPLC-UV and, where needed, NMR for structural confirmation. Regulatory evaluation focuses on impurity profiling and degradation pathway mapping under ICH Q3A/Q3B principles.
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