发明人罗永刚,郭海燕,张德明. "Method for the Synthesis of 7-(tert-Butoxycarbonyl)-1-oxa-7-azaspiro[3.5]nonane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 117627440 B, 授权公告日 2017-05-17.
发明人郭海燕,杨光,刘建华. "A Process for Preparing High-Purity 7-(tert-Butoxycarbonyl)-1-oxa-7-azaspiro[3.5]nonane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109289830 A, 授权公告日 2022-04-15.
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