发明人钱学锋,李文辉,沈红梅. "Method for the Synthesis of (6R)-5-(tert-butoxycarbonyl)-1,1-difluoro-5-azaspiro[2.4]Heptane-6-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109120768 B, 授权公告日 2015-06-17.
发明人高志强,林芳,马晓峰. "A Process for Preparing High-Purity (6R)-5-(tert-butoxycarbonyl)-1,1-difluoro-5-azaspiro[2.4]Heptane-6-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109168045 A, 授权公告日 2015-03-23.
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