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发明人郑宇鹏,郭海燕,林芳. "A Process for Preparing High-Purity 6-(chlorosulfonyl)-3,4-dihydro-2H-1-benzopyran-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 115315493 A, 授权公告日 2017-08-22.
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