Upadacitinib Des Tosyl Impurity (CAS 1708997-43-6) is a structurally related process impurity arising from incomplete tosyl protection removal during upadacitinib synthesis. It is characterized by mass spectrometry and retention behavior consistent with des-tosylated analogs and commonly monitored by validated HPLC and LC-MS methods to support impurity profiling and batch release. Typical control measures include reaction optimization, purification by crystallization or preparative chromatography, and specification limits defined per ICH Q3A guidelines. Stability studies assess its formation under thermal and hydrolytic stress, while accurate quantitation at low ppm levels is critical to ensure API purity and regulatory compliance.
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