Sørensen M, Nowak P, Jørgensen K. "Method for the Synthesis of 2-Hydroxy-4-oxo-N-(pyridin-2-yl)-4H-pyrido[1,2-a]pyrimidine-3-carboxamide" [P]. European Patent, EP 3177157 A1, 2021-10-10.
发明人孙丽萍,韩伟,郭海燕. "A Process for Preparing High-Purity 2-Hydroxy-4-oxo-N-(pyridin-2-yl)-4H-pyrido[1,2-a]pyrimidine-3-carboxamide" [P]. 中国发明专利, 专利号 CN 114741061 B, 授权公告日 2021-07-06.
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