Yamamoto T, Hughes D C, Williams B T. "Method for the Synthesis of 8-Ethyl-4-(4-methyl-3-nitrobenzoyl)-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxylic acid" [P]. US Patent, US 11987780 B2, 2021-02-17.
发明人王建平,高志强,唐晓军. "A Process for Preparing High-Purity 8-Ethyl-4-(4-methyl-3-nitrobenzoyl)-1-oxa-4,8-diazaspiro[4.5]decane-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 115973791 B, 授权公告日 2025-08-11.
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