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Stevens L M, Brown S R, Yamamoto T. "Method for the Synthesis of 6-(((9H-Fluoren-9-yl)methoxy)carbonyl)-8-cyano-6-azaspiro[3.4]octane-2-carboxylic acid" [P]. US Patent, US 10393465 B2, 2018-02-22.
发明人张德明,朱建伟,沈红梅. "A Process for Preparing High-Purity 6-(((9H-Fluoren-9-yl)methoxy)carbonyl)-8-cyano-6-azaspiro[3.4]octane-2-carboxylic acid" [P]. 中国发明专利, 专利号 CN 114699353 B, 授权公告日 2022-12-26.
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