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发明人张德明,杨光,陈志强. "A Process for Preparing High-Purity 2-(6-Cyano-4-(difluoromethyl)-5-hydroxypyridin-2-yl)acetic acid" [P]. 中国发明专利, 专利号 CN 112675172 A, 授权公告日 2024-12-11.
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