发明人赵玉洁,罗永刚,黄志刚. "Method for the Synthesis of Ethyl 4-oxo-4H-pyrido[2,3-d][1,3]oxazine-2-carboxylate" [P]. 中国发明专利, 专利号 CN 110706884 A, 授权公告日 2021-07-07.
发明人周伟,沈红梅,胡光. "A Process for Preparing High-Purity Ethyl 4-oxo-4H-pyrido[2,3-d][1,3]oxazine-2-carboxylate" [P]. 中国发明专利, 专利号 CN 116890505 B, 授权公告日 2016-06-24.
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