Anderson J P, Schröder R, Chen K W. "一种的合成方法" [P]. US Patent, US 11543850 B2, 2017-04-18.
Davis P L, Roberts E F, Yamamoto T. "Method for the Synthesis of 2-methyl-2H,4H,7H-pyrazolo[4,3-d]pyrimidin-7-one" [P]. US Patent, US 10505026 B2, 2016-02-05.
发明人高志强,赵玉洁,郑宇鹏. "A Process for Preparing High-Purity 2-methyl-2H,4H,7H-pyrazolo[4,3-d]pyrimidin-7-one" [P]. 中国发明专利, 专利号 CN 111345421 B, 授权公告日 2019-02-02.
参考文献 Literature
Jensen P, Larsen A M, Olsen K. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". J. Agric. Food Chem., 2021, 1691, 1534-1556.
Martinez C, Lopez D R. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Food Chem., 2019, 1534, (10), 8218-8228.
Zhang Y, Li Q, Chen T. "Identification and Structural Characterization of a Novel Degradation Product of 2-methyl-2H,4H,7H-pyrazolo[4,3-d]pyrimidin-7-one Using HRMS and NMR". J. Chromatogr. A, 2018, 1891, (2), 1885-1913.