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发明人钱学锋,沈红梅,罗永刚. "A Process for Preparing High-Purity Tert-butyl (R)-3-methyl-4-(6-nitropyridin-3-yl)piperazine-1-carboxylate" [P]. 中国发明专利, 专利号 CN 114458456 A, 授权公告日 2017-09-07.
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