发明人郭海燕,朱建伟,马晓峰. "Method for the Synthesis of tert-Butyl 3,5-dioxo-9-oxa-2-azaspiro[5.5]undecane-2-carboxylate" [P]. 中国发明专利, 专利号 CN 116413839 A, 授权公告日 2023-09-01.
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