发明人徐明华,杨光,孙丽萍. "Method for the Synthesis of 9,9-Difluoro-2-azaspiro[5.5]undecane" [P]. 中国发明专利, 专利号 CN 109701850 A, 授权公告日 2023-02-14.
发明人李文辉,钱学锋,黄志刚. "A Process for Preparing High-Purity 9,9-Difluoro-2-azaspiro[5.5]undecane" [P]. 中国发明专利, 专利号 CN 116608913 A, 授权公告日 2018-10-11.
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