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发明人朱建伟,黄志刚,孙丽萍. "A Process for Preparing High-Purity 6-(((9H-Fluoren-9-yl)methoxy)carbonyl)-1-cyano-6-azaspiro[2.5]octane-1-carboxylic acid" [P]. 中国发明专利, 专利号 CN 117925430 A, 授权公告日 2022-11-06.
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