发明人沈红梅,李文辉,何建平. "Method for the Synthesis of 9-Hydroxy-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111089444 B, 授权公告日 2019-05-18.
发明人唐晓军,刘建华,沈红梅. "A Process for Preparing High-Purity 9-Hydroxy-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109171970 B, 授权公告日 2022-12-23.
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