发明人韩伟,赵玉洁,杨光. "一种的合成方法" [P]. 中国发明专利, 专利号 CN 112482686 A, 授权公告日 2017-11-23.
发明人李文辉,刘建华,郭海燕. "Method for the Synthesis of 4-[4-(Dimethylamino)benzoyl]-8-ethyl-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 112455739 A, 授权公告日 2017-02-15.
发明人唐晓军,杨光,徐明华. "A Process for Preparing High-Purity 4-[4-(Dimethylamino)benzoyl]-8-ethyl-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 110395675 A, 授权公告日 2017-06-25.
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