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发明人孙丽萍,王建平,马晓峰. "Method for the Synthesis of 4-(tert-butoxycarbonyl)-1-(3-cyanopyridin-2-yl)piperazine-2-carboxylic acid" [P]. 中国发明专利, 专利号 CN 113269404 A, 授权公告日 2016-12-25.
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