发明人朱建伟,黄志刚,赵玉洁. "Method for the Synthesis of Methyl 3-(4-(difluoromethyl)-2-ethyl-3-methyl-6-oxo-2H-pyrazolo[3,4-b]pyridin-7(6H)-yl)propanoate" [P]. 中国发明专利, 专利号 CN 116948332 A, 授权公告日 2021-01-15.
发明人孙丽萍,郑宇鹏,李文辉. "A Process for Preparing High-Purity Methyl 3-(4-(difluoromethyl)-2-ethyl-3-methyl-6-oxo-2H-pyrazolo[3,4-b]pyridin-7(6H)-yl)propanoate" [P]. 中国发明专利, 专利号 CN 110409804 B, 授权公告日 2019-12-19.
参考文献 Literature
Xu M, Hu Y, Zhou D. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Agric. Food Chem., 2015, 1978, (10), 9938-9948.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chemosphere, 2021, 351, 1300-1321.
Brown R C, Davis S M. "Identification and Structural Characterization of a Novel Degradation Product of Methyl 3-(4-(difluoromethyl)-2-ethyl-3-methyl-6-oxo-2H-pyrazolo[3,4-b]pyridin-7(6H)-yl)propanoate Using HRMS and NMR". Molecules, 2023, 1022, (5), 3163-3169.
Brown R C, Davis S M. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Pharm. Biomed. Anal., 2015, 1677, (5), 7230-7236.