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发明人李文辉,钱学锋,郑宇鹏. "A Process for Preparing High-Purity 4-Chloro-5H-pyrimido[4,5-b][1,4]oxazin-6(7H)-one" [P]. 中国发明专利, 专利号 CN 110571832 B, 授权公告日 2022-02-13.
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