发明人马晓峰,韩伟,王建平. "Method for the Synthesis of 1-Ethyl-4-hydroxyindolin-2-one" [P]. 中国发明专利, 专利号 CN 114867924 B, 授权公告日 2018-10-09.
发明人李文辉,高志强,刘建华. "A Process for Preparing High-Purity 1-Ethyl-4-hydroxyindolin-2-one" [P]. 中国发明专利, 专利号 CN 117154798 A, 授权公告日 2022-01-08.
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