发明人林芳,孙丽萍,郑宇鹏. "Method for the Synthesis of tert-Butyl (S)-3-methyl-5-oxo-1-oxa-4,9-diazaspiro[5.5]undecane-9-carboxylate" [P]. 中国发明专利, 专利号 CN 114881529 A, 授权公告日 2018-04-23.
Nielsen H, Kowalski A, Johansson L. "A Process for Preparing High-Purity tert-Butyl (S)-3-methyl-5-oxo-1-oxa-4,9-diazaspiro[5.5]undecane-9-carboxylate" [P]. European Patent, EP 3554635 A1, 2022-01-20.
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