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发明人徐明华,赵玉洁,胡光. "A Process for Preparing High-Purity 6-Chloro-4-[(4-methylphenyl)sulfonyl]-3,4-dihydro-2H-1,4-benzoxazine-2-carboxylic acid" [P]. 中国发明专利, 专利号 CN 111021081 A, 授权公告日 2020-03-26.
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