O'Brien P Q, Roberts E F, Kumar R. "一种的合成方法" [P]. US Patent, US 9007590 B2, 2020-02-09.
Roberts E F, Chen K W, Stevens L M. "Method for the Synthesis of 1,5-Dimethyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(4H)-one" [P]. US Patent, US 11872148 B2, 2024-03-14.
参考文献 Literature
Kim S H, Park J Y. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Molecules, 2012, 1067, (4), 3645-3667.
Wang L, Li J, Zhang H. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Environ. Sci. Technol., 2020, 1995, (12), 8723-8728.
Yang F, Sun W, Liu J. "Identification and Structural Characterization of a Novel Degradation Product of 1,5-Dimethyl-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-7(4H)-one Using HRMS and NMR". Anal. Chim. Acta, 2014, 753, 7741-7768.
Fischer P, Wagner E. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Chemosphere, 2017, 1856, (6), 6066-6095.