发明人王建平,徐明华,罗永刚. "Method for the Synthesis of o7-Tert-butylo3-ethyl1-oxa-2,7-diazaspiro[4.4]non-2-ene-3,7-dicarboxylate" [P]. 中国发明专利, 专利号 CN 110911530 B, 授权公告日 2017-12-24.
发明人何建平,冯建国,郑宇鹏. "A Process for Preparing High-Purity o7-Tert-butylo3-ethyl1-oxa-2,7-diazaspiro[4.4]non-2-ene-3,7-dicarboxylate" [P]. 中国发明专利, 专利号 CN 109550090 A, 授权公告日 2015-02-25.
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