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发明人李文辉,韩伟,钱学锋. "A Process for Preparing High-Purity ethyl 3-(3,4-dihydro-1H-2-benzopyran-1-yl)-2-oxopropanoate" [P]. 中国发明专利, 专利号 CN 113893889 A, 授权公告日 2022-01-20.
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