发明人杨光,何建平,王建平. "Method for the Synthesis of 3-Ethyl-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one" [P]. 中国发明专利, 专利号 CN 116290856 B, 授权公告日 2016-06-17.
发明人孙丽萍,杨光,韩伟. "A Process for Preparing High-Purity 3-Ethyl-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one" [P]. 中国发明专利, 专利号 CN 115768443 A, 授权公告日 2016-09-16.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Sep. Sci., 2019, 1651, (3), 4571-4585.
Lee J H, Choi Y S. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Sci. Total Environ., 2010, 1773, 7524-7535.
Smith J A, Johnson M B. "Identification and Structural Characterization of a Novel Degradation Product of 3-Ethyl-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one Using HRMS and NMR". Anal. Chim. Acta, 2020, 1215, (7), 8066-8079.
Hughes D, Roberts J, Thomas A. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Anal. Methods, 2015, 1050, (11), 3633-3655.