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发明人何建平,徐明华,胡光. "Method for the Synthesis of 1,7-Diazaspiro[4.4]nonane-7-carboxylic acid, 1,1-dimethylethyl ester" [P]. 中国发明专利, 专利号 CN 108109880 A, 授权公告日 2017-08-22.
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