发明人马晓峰,徐明华,赵玉洁. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 116398636 A, 授权公告日 2020-10-23.
发明人冯建国,王建平,郭海燕. "Method for the Synthesis of Pyrimido[5,4-d]Pyrimidine Impurity 7" [P]. 中国发明专利, 专利号 CN 110997719 B, 授权公告日 2025-02-21.
发明人罗永刚,马晓峰,王建平. "A Process for Preparing High-Purity Pyrimido[5,4-d]Pyrimidine Impurity 7" [P]. 中国发明专利, 专利号 CN 115079936 B, 授权公告日 2020-07-27.
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". Anal. Chem., 2012, 1989, (2), 1282-1306.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Chromatographia, 2012, 424, 648-670.
Kumar A, Sharma P, Patel R S. "Identification and Structural Characterization of a Novel Degradation Product of Pyrimido[5,4-d]Pyrimidine Impurity 7 Using HRMS and NMR". Molecules, 2016, 1814, 596-603.