Chen K W, Johnson M A, Fischer A B. "一种的合成方法" [P]. US Patent, US 11790305 B2, 2015-11-27.
Nowak P, Kowalski A, Martínez F. "Method for the Synthesis of 4-(Isopropylthio)-1,3-dimethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. European Patent, EP 3514937 A1, 2020-02-11.
发明人罗永刚,唐晓军,郭海燕. "A Process for Preparing High-Purity 4-(Isopropylthio)-1,3-dimethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid" [P]. 中国发明专利, 专利号 CN 112305967 B, 授权公告日 2022-11-10.
参考文献 Literature
Yang F, Sun W, Liu J. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Molecules, 2012, 1491, 9554-9579.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2018, 2091, (3), 9765-9786.
Lee J H, Choi Y S. "Identification and Structural Characterization of a Novel Degradation Product of 4-(Isopropylthio)-1,3-dimethyl-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acid Using HRMS and NMR". Rapid Commun. Mass Spectrom., 2012, 1422, 8955-8968.
Garcia M, Rodriguez P. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Agric. Food Chem., 2015, 323, 2830-2847.