发明人杨光,孙丽萍,胡光. "Method for the Synthesis of Ethyl 1-(3-formyl-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl)piperidine-4-carboxylate" [P]. 中国发明专利, 专利号 CN 114094650 B, 授权公告日 2015-05-07.
发明人朱建伟,冯建国,黄志刚. "A Process for Preparing High-Purity Ethyl 1-(3-formyl-9-methyl-4-oxo-4H-pyrido[1,2-a]pyrimidin-2-yl)piperidine-4-carboxylate" [P]. 中国发明专利, 专利号 CN 112221914 B, 授权公告日 2015-08-11.
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