发明人王建平,徐明华,郑宇鹏. "Method for the Synthesis of Ethyl 4-hydroxy-4-methyl-1-oxa-9-azaspiro[5.5]Undecane-9-carboxylate" [P]. 中国发明专利, 专利号 CN 116469724 B, 授权公告日 2018-05-13.
发明人韩伟,王建平,马晓峰. "A Process for Preparing High-Purity Ethyl 4-hydroxy-4-methyl-1-oxa-9-azaspiro[5.5]Undecane-9-carboxylate" [P]. 中国发明专利, 专利号 CN 108399336 A, 授权公告日 2017-08-14.
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