Nowak P, Jørgensen K, Johansson L. "Method for the Synthesis of 2-[(5-Ethyl-4-methylthiophen-2-yl)formamido]acetic acid" [P]. European Patent, EP 3865741 A1, 2025-02-09.
发明人李文辉,冯建国,刘建华. "A Process for Preparing High-Purity 2-[(5-Ethyl-4-methylthiophen-2-yl)formamido]acetic acid" [P]. 中国发明专利, 专利号 CN 113775754 A, 授权公告日 2022-07-04.
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