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发明人林芳,刘建华,杨光. "A Process for Preparing High-Purity 5-Amino-7-bromo-3,4-dihydro-2H-1,4-benzoxazin-3-one" [P]. 中国发明专利, 专利号 CN 109341438 A, 授权公告日 2020-04-23.
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