Upadacitinib Des TFEA Carbamate Impurity (CAS 1428243-28-0) is a process-related organic impurity associated with the upadacitinib synthetic route, arising from aberrant carbamoylation or loss of the tetrafluoroethylamine-derived side chain during intermediate conversion. With molecular formula C21H23N5O2S and molecular weight 409.50 g/mol, it reflects a structurally defined non-volatile component rather than a simple degradation product. Its characterization typically requires LC-MS/MS for molecular ion confirmation and LC-UV or HPLC with mass-sensitive detection for quantification, with orthogonal NMR support when needed. Because the impurity is route-specific, it is evaluated within impurity control and ICH M7 risk assessment frameworks as applicable.
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