Roxadustat Impurity 13 (CAS 1809286-36-9) is a characterized synthetic byproduct detected in manufacturing and stability studies of Roxadustat, demanding precise analytical characterization and control. Structural elucidation by LC-MS, NMR and HRMS identifies its molecular features to inform degradation pathways and process optimization. Quantitative determination via validated HPLC methods supports impurity profiling, specification setting and batch release decisions, while forced degradation studies establish its formation kinetics and stability liabilities. Understanding this impurity is critical for impurity risk assessment, regulatory submissions and implementing corrective process controls to ensure consistent drug substance quality and compliance with ICH guidelines.
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