发明人徐明华,冯建国,王建平. "Method for the Synthesis of Tert-butyl 3,3-difluoro-1,6-diazaspiro[3.3]Heptane-6-carboxylate" [P]. 中国发明专利, 专利号 CN 109657691 B, 授权公告日 2023-04-26.
发明人马晓峰,徐明华,郭海燕. "A Process for Preparing High-Purity Tert-butyl 3,3-difluoro-1,6-diazaspiro[3.3]Heptane-6-carboxylate" [P]. 中国发明专利, 专利号 CN 112003683 B, 授权公告日 2017-06-18.
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