发明人徐明华,何建平,罗永刚. "Method for the Synthesis of Ethyl 2'-oxospiro[cyclopropane-1,3'-indoline]-2-carboxylate" [P]. 中国发明专利, 专利号 CN 113026193 A, 授权公告日 2021-03-03.
发明人郭海燕,马晓峰,陈志强. "A Process for Preparing High-Purity Ethyl 2'-oxospiro[cyclopropane-1,3'-indoline]-2-carboxylate" [P]. 中国发明专利, 专利号 CN 110140237 B, 授权公告日 2016-05-13.
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