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发明人林芳,罗永刚,唐晓军. "A Process for Preparing High-Purity 2-(6-Butoxy-3-hydroxyquinoline-2-carboxamido)acetic acid" [P]. 中国发明专利, 专利号 CN 111088296 B, 授权公告日 2016-10-12.
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