ent-Abacavir EP Impurity D (CAS 2079853-44-2) is a stereochemical impurity encountered during synthesis and storage of abacavir. Analytical characterization typically employs chiral HPLC and LC-MS with confirmatory NMR to define retention behavior | mass fragments and stereochemical configuration. This low-level enantiomeric impurity can arise from epimerization or incomplete stereoselective synthesis and has implications for potency | stability and regulatory compliance. Robust impurity profiling | validated chiral analytical methods | targeted degradation studies and tight specification limits are recommended to monitor and control its presence in drug substance and formulation. Data-driven risk assessment supports appropriate acceptance criteria and mitigation strategies.
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