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发明人冯建国,周伟,郑宇鹏. "A Process for Preparing High-Purity [(4-methyl-2-oxo-2H-chromen-6-yl)oxy]acetic acid" [P]. 中国发明专利, 专利号 CN 115918599 A, 授权公告日 2018-01-22.
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