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发明人李文辉,孙丽萍,杨光. "Method for the Synthesis of 2-(7-Methyl-1,7-diazaspiro[4.4]nonan-1-yl)-1,3,4-oxadiazole" [P]. 中国发明专利, 专利号 CN 113853355 B, 授权公告日 2023-06-14.
发明人郭海燕,张德明,周伟. "A Process for Preparing High-Purity 2-(7-Methyl-1,7-diazaspiro[4.4]nonan-1-yl)-1,3,4-oxadiazole" [P]. 中国发明专利, 专利号 CN 113209784 A, 授权公告日 2021-10-17.
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