Anderson J P, Brown S R, Patel M V. "一种的合成方法" [P]. US Patent, US 10473591 B2, 2021-02-10.
发明人张德明,唐晓军,胡光. "Method for the Synthesis of 1-(3,4-Dimethylphenyl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one" [P]. 中国发明专利, 专利号 CN 109017998 B, 授权公告日 2018-04-28.
发明人高志强,李文辉,张德明. "A Process for Preparing High-Purity 1-(3,4-Dimethylphenyl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one" [P]. 中国发明专利, 专利号 CN 116085343 A, 授权公告日 2017-11-20.
参考文献 Literature
Kumar A, Sharma P, Patel R S. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Chromatographia, 2015, 950, (8), 1154-1161.
Hughes D, Roberts J, Thomas A. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Anal. Chim. Acta, 2017, 2142, (6), 1871-1891.
Chen X Y, Liu M, Zhao W Q. "Identification and Structural Characterization of a Novel Degradation Product of 1-(3,4-Dimethylphenyl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one Using HRMS and NMR". Phytochemistry, 2021, 1249, (9), 8608-8623.