Johnson M A, Anderson J P, Patel M V. "一种的合成方法" [P]. US Patent, US 10001388 B2, 2015-02-04.
Brown S R, Lee S K, Thompson G K. "Method for the Synthesis of 7-Methyl-4-oxo-4h-pyrido[1,2-a]pyrimidine-3-carboxylic acid" [P]. US Patent, US 11506618 B2, 2020-04-16.
发明人王建平,郭海燕,沈红梅. "A Process for Preparing High-Purity 7-Methyl-4-oxo-4h-pyrido[1,2-a]pyrimidine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 112850948 A, 授权公告日 2024-07-12.
参考文献 Literature
Wang L, Li J, Zhang H. "Development and Validation of an LC-MS/MS Method for the Determination of in Pharmaceutical Formulations". Molecules, 2022, 730, (2), 933-949.
Chen X Y, Liu M, Zhao W Q. "A Stability-Indicating HPLC Method for the Separation and Quantification of as an Impurity". Biomed. Chromatogr., 2024, 1194, (9), 4493-4501.
Kim S H, Park J Y. "Identification and Structural Characterization of a Novel Degradation Product of 7-Methyl-4-oxo-4h-pyrido[1,2-a]pyrimidine-3-carboxylic acid Using HRMS and NMR". J. Pharm. Biomed. Anal., 2024, 2028, 3548-3571.