发明人杨光,胡光,李文辉. "Method for the Synthesis of 4-((2-Ethoxy-3,4-dioxocyclobut-1-en-1-yl)amino)benzoic acid" [P]. 中国发明专利, 专利号 CN 109269708 B, 授权公告日 2017-05-05.
发明人胡光,孙丽萍,刘建华. "A Process for Preparing High-Purity 4-((2-Ethoxy-3,4-dioxocyclobut-1-en-1-yl)amino)benzoic acid" [P]. 中国发明专利, 专利号 CN 112663889 B, 授权公告日 2017-04-19.
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