发明人林芳,罗永刚,高志强. "Method for the Synthesis of Ethyl 1-oxo-2-azaspiro[4.4]Nonane-7-carboxylate" [P]. 中国发明专利, 专利号 CN 112559718 A, 授权公告日 2016-03-16.
发明人黄志刚,王建平,赵玉洁. "A Process for Preparing High-Purity Ethyl 1-oxo-2-azaspiro[4.4]Nonane-7-carboxylate" [P]. 中国发明专利, 专利号 CN 110409632 B, 授权公告日 2015-11-09.
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