Lefèvre J P, Rossi M, Nowak P. "Method for the Synthesis of Methyl 4-oxo-4H-pyrimido[1,2-a]pyrimidine-2-carboxylate" [P]. European Patent, EP 3001597 A1, 2023-06-21.
发明人沈红梅,王建平,杨光. "A Process for Preparing High-Purity Methyl 4-oxo-4H-pyrimido[1,2-a]pyrimidine-2-carboxylate" [P]. 中国发明专利, 专利号 CN 113700969 A, 授权公告日 2016-10-17.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Sci. Total Environ., 2017, 1300, 9853-9866.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". J. Chromatogr. A, 2018, 235, (4), 4224-4234.
Zhou X P, Huang L, Wu G. "Identification and Structural Characterization of a Novel Degradation Product of Methyl 4-oxo-4H-pyrimido[1,2-a]pyrimidine-2-carboxylate Using HRMS and NMR". Anal. Methods, 2025, 1684, (10), 4848-4862.
Hughes D, Roberts J, Thomas A. "Forced Degradation Studies to Evaluate Profile in Drug Substances According to ICH Guidelines". Talanta, 2012, 1901, (7), 976-1004.