发明人罗永刚,杨光,黄志刚. "Method for the Synthesis of 8-{[(9H-fluoren-9-yl)methoxy]carbonyl}-1-oxa-2,8-diazaspiro[4.5]dec-2-ene-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 113451414 A, 授权公告日 2023-05-05.
发明人徐明华,马晓峰,周伟. "A Process for Preparing High-Purity 8-{[(9H-fluoren-9-yl)methoxy]carbonyl}-1-oxa-2,8-diazaspiro[4.5]dec-2-ene-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111649392 B, 授权公告日 2018-03-14.
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