发明人黄志刚,钱学锋,李文辉. "Method for the Synthesis of Methyl (3R,4S)-3-ethyl-4-hydrazinylpiperidine-1-carboxylate" [P]. 中国发明专利, 专利号 CN 116973057 B, 授权公告日 2015-06-05.
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