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发明人孙丽萍,陈志强,郭海燕. "A Process for Preparing High-Purity 6-Ethyl-4-(7-methoxybenzofuran-2-yl)-2H-chromen-2-one" [P]. 中国发明专利, 专利号 CN 112092909 B, 授权公告日 2019-06-06.
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