Johansson L, Nowak P, Lefèvre J P. "一种的合成方法" [P]. European Patent, EP 3210163 A1, 2019-02-19.
发明人沈红梅,张德明,徐明华. "Method for the Synthesis of 3-Cyclopentyl-5-(1-hydroxyethyl)-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one" [P]. 中国发明专利, 专利号 CN 110150674 A, 授权公告日 2020-07-10.
Williams B T, Fischer A B, Stevens L M. "A Process for Preparing High-Purity 3-Cyclopentyl-5-(1-hydroxyethyl)-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one" [P]. US Patent, US 9665333 B2, 2025-04-22.
参考文献 Literature
Garcia M, Rodriguez P. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Biomed. Chromatogr., 2018, 882, 8985-8998.
Smith J A, Johnson M B. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Nat. Prod., 2024, 1501, 4828-4851.
Chen X Y, Liu M, Zhao W Q. "Identification and Structural Characterization of a Novel Degradation Product of 3-Cyclopentyl-5-(1-hydroxyethyl)-1,6-dihydro-7H-pyrazolo[4,3-d]pyrimidin-7-one Using HRMS and NMR". Food Chem., 2012, 330, (1), 3935-3947.
Smith J A, Johnson M B. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". J. Agric. Food Chem., 2020, 1367, 2941-2949.