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发明人刘建华,张德明,周伟. "A Process for Preparing High-Purity Ethyl 2-(difluoromethyl)-6-oxo-1,4,5,6-tetrahydropyridine-3-carboxylate" [P]. 中国发明专利, 专利号 CN 108945177 B, 授权公告日 2017-04-09.
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