Upadacitinib Enantiomer Impurity (CAS 1310726-59-0) is the chiral counter enantiomer encountered during synthesis and resolution of upadacitinib. Monitoring this enantiomeric impurity is essential to ensure stereochemical purity and compliance with regulatory impurity limits. Analytical characterization commonly employs chiral high-performance liquid chromatography, chiroptical methods, polarimetry, nuclear magnetic resonance and mass spectrometry to determine enantiomeric excess, confirm structure and achieve trace level quantitation. Stability assessment and process development address potential racemization pathways, while control strategies including in-process controls, validated assays and defined specification limits mitigate risk to pharmaceutical quality in line with ICH impurity guidance.
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