发明人王建平,林芳,陈志强. "Method for the Synthesis of Ethyl 4-((4-methoxybenzyl)amino)-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate" [P]. 中国发明专利, 专利号 CN 108135437 A, 授权公告日 2017-12-03.
发明人林芳,胡光,杨光. "A Process for Preparing High-Purity Ethyl 4-((4-methoxybenzyl)amino)-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate" [P]. 中国发明专利, 专利号 CN 114995423 B, 授权公告日 2020-11-16.
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". Molecules, 2011, 1289, (10), 1817-1822.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Sci. Total Environ., 2024, 1772, 9537-9542.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of Ethyl 4-((4-methoxybenzyl)amino)-1-methyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylate Using HRMS and NMR". J. Sep. Sci., 2011, 1467, 8041-8050.
Smith J A, Johnson M B. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Talanta, 2013, 1919, (11), 9825-9845.