发明人刘建华,马晓峰,郭海燕. "Method for the Synthesis of 4-((7-Fluoro-9-oxo-9H-fluoren-2-yl)amino)-4-oxobut-2-enoic acid" [P]. 中国发明专利, 专利号 CN 110071906 A, 授权公告日 2018-07-06.
发明人黄志刚,沈红梅,钱学锋. "A Process for Preparing High-Purity 4-((7-Fluoro-9-oxo-9H-fluoren-2-yl)amino)-4-oxobut-2-enoic acid" [P]. 中国发明专利, 专利号 CN 114859442 A, 授权公告日 2016-05-25.
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