发明人杨光,孙丽萍,冯建国. "Method for the Synthesis of Methyl 4-oxo-4H-pyrido[1,2-a]pyrimidine-9-carboxylate" [P]. 中国发明专利, 专利号 CN 111467445 B, 授权公告日 2019-11-27.
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