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发明人张德明,黄志刚,杨光. "A Process for Preparing High-Purity cis-3-Methyl-4-(phenylamino)-1-(phenylmethyl)-4-piperidinecarboxylic Acid Methyl Ester" [P]. 中国发明专利, 专利号 CN 109458615 A, 授权公告日 2017-12-15.
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