发明人郭海燕,胡光,冯建国. "Method for the Synthesis of Ethyl 4-((2-ethoxy-3,4-dioxocyclobut-1-en-1-yl)amino)piperidine-1-carboxylate" [P]. 中国发明专利, 专利号 CN 110070984 B, 授权公告日 2023-07-06.
发明人钱学锋,朱建伟,李文辉. "A Process for Preparing High-Purity Ethyl 4-((2-ethoxy-3,4-dioxocyclobut-1-en-1-yl)amino)piperidine-1-carboxylate" [P]. 中国发明专利, 专利号 CN 109274925 A, 授权公告日 2016-03-01.
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