发明人李文辉,徐明华,冯建国. "Method for the Synthesis of Istradefylline Impurity 23" [P]. 中国发明专利, 专利号 CN 111689345 B, 授权公告日 2016-01-23.
发明人周伟,钱学锋,唐晓军. "A Process for Preparing High-Purity Istradefylline Impurity 23" [P]. 中国发明专利, 专利号 CN 114793431 B, 授权公告日 2022-02-25.
参考文献 Literature
Chen X Y, Liu M, Zhao W Q. "Development and Validation of an LC-MS/MS Method for the Determination of 伊曲茶碱杂质23 in Pharmaceutical Formulations". Anal. Chem., 2024, 2475, (1), 4426-4445.
Zhang Y, Li Q, Chen T. "A Stability-Indicating HPLC Method for the Separation and Quantification of 伊曲茶碱杂质23 as an Impurity". Rapid Commun. Mass Spectrom., 2010, 1481, 1921-1934.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of Istradefylline Impurity 23 Using HRMS and NMR". Environ. Sci. Technol., 2019, 2227, (8), 7684-7704.
Yang F, Sun W, Liu J. "Forced Degradation Studies to Evaluate 伊曲茶碱杂质23 Profile in Drug Substances According to ICH Guidelines". J. Chromatogr. A, 2013, 795, 1486-1491.