Martínez F, Kowalski A, Lefèvre J P. "一种的合成方法" [P]. European Patent, EP 3298844 A1, 2019-06-21.
发明人沈红梅,林芳,冯建国. "Method for the Synthesis of 1-(2-Hydroxyethyl)-3-methyl-1h-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111022961 B, 授权公告日 2018-03-18.
发明人周伟,李文辉,林芳. "A Process for Preparing High-Purity 1-(2-Hydroxyethyl)-3-methyl-1h-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 112071996 A, 授权公告日 2023-06-08.
参考文献 Literature
Yamamoto K, Tanaka H, Suzuki T. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Talanta, 2011, 2458, 6497-6519.
Zhang Y, Li Q, Chen T. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Chim. Acta, 2021, 1166, (11), 1068-1075.
Fischer P, Wagner E. "Identification and Structural Characterization of a Novel Degradation Product of 1-(2-Hydroxyethyl)-3-methyl-1h-pyrazolo[3,4-b]pyridine-5-carboxylic acid Using HRMS and NMR". J. Pharm. Biomed. Anal., 2025, 1675, 2289-2307.
Mueller T, Schmidt R K. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Methods, 2016, 1261, (3), 2732-2735.