发明人郑宇鹏,罗永刚,韩伟. "Method for the Synthesis of 4-oxo-1H,4H,7H-pyrazolo[3,4-d]pyrimidine-6-sulfinic acid" [P]. 中国发明专利, 专利号 CN 112156050 A, 授权公告日 2016-01-27.
发明人赵玉洁,黄志刚,钱学锋. "A Process for Preparing High-Purity 4-oxo-1H,4H,7H-pyrazolo[3,4-d]pyrimidine-6-sulfinic acid" [P]. 中国发明专利, 专利号 CN 112036848 B, 授权公告日 2018-07-08.
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 in Pharmaceutical Formulations". J. Agric. Food Chem., 2016, 2379, (4), 1088-1093.
Martinez C, Lopez D R. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Chim. Acta, 2015, 400, (8), 7670-7678.
Hughes D, Roberts J, Thomas A. "Identification and Structural Characterization of a Novel Degradation Product of 4-oxo-1H,4H,7H-pyrazolo[3,4-d]pyrimidine-6-sulfinic acid Using HRMS and NMR". Chemosphere, 2021, 1824, (4), 2045-2049.
Kowalski T, Nowak Z. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Chromatographia, 2023, 2235, 4045-4048.