Thompson G K, Roberts E F, Yamamoto T. "Method for the Synthesis of Enarodustat Impurity 9" [P]. US Patent, US 11673918 B2, 2019-12-17.
Patel M V, Hughes D C, O'Brien P Q. "A Process for Preparing High-Purity Enarodustat Impurity 9" [P]. US Patent, US 11207814 B2, 2025-10-23.
参考文献 Literature
Kowalski T, Nowak Z. "Development and Validation of an LC-MS/MS Method for the Determination of 恩那度司他杂质9 in Pharmaceutical Formulations". Chromatographia, 2023, 1384, (8), 9985-10015.
Wang L, Li J, Zhang H. "A Stability-Indicating HPLC Method for the Separation and Quantification of 恩那度司他杂质9 as an Impurity". J. Sep. Sci., 2013, 928, 68-97.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of Enarodustat Impurity 9 Using HRMS and NMR". Anal. Chim. Acta, 2021, 2335, 6562-6591.
Kumar A, Sharma P, Patel R S. "Forced Degradation Studies to Evaluate 恩那度司他杂质9 Profile in Drug Substances According to ICH Guidelines". Sci. Total Environ., 2021, 1563, (3), 7889-7899.