发明人王建平,韩伟,高志强. "Method for the Synthesis of 2-(4-Ethyl-2,3-dioxopiperazine-1-carboxamido)-2-(4-hydroxyphenyl)acetic Acid" [P]. 中国发明专利, 专利号 CN 115577764 A, 授权公告日 2015-06-11.
发明人林芳,徐明华,高志强. "A Process for Preparing High-Purity 2-(4-Ethyl-2,3-dioxopiperazine-1-carboxamido)-2-(4-hydroxyphenyl)acetic Acid" [P]. 中国发明专利, 专利号 CN 110710479 A, 授权公告日 2024-01-15.
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