发明人王建平,林芳,黄志刚. "Method for the Synthesis of Methyl 2-[(2-methoxy-3,4-dioxocyclobut-1-en-1-yl)amino]thiophene-3-carboxylate" [P]. 中国发明专利, 专利号 CN 116812249 B, 授权公告日 2024-10-18.
发明人马晓峰,唐晓军,郭海燕. "A Process for Preparing High-Purity Methyl 2-[(2-methoxy-3,4-dioxocyclobut-1-en-1-yl)amino]thiophene-3-carboxylate" [P]. 中国发明专利, 专利号 CN 116997655 B, 授权公告日 2023-12-22.
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