Jørgensen K, Nowak P, Lefèvre J P. "Method for the Synthesis of 4-(4-Nitrobenzoyl)-1-oxa-4-azaspiro[4.5]decane-3-carboxylic acid" [P]. European Patent, EP 3836341 A1, 2016-09-18.
发明人徐明华,马晓峰,唐晓军. "A Process for Preparing High-Purity 4-(4-Nitrobenzoyl)-1-oxa-4-azaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 113927005 B, 授权公告日 2022-07-28.
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