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发明人杨光,冯建国,李文辉. "A Process for Preparing High-Purity Ethyl 2-(chloromethyl)-5-methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxylate" [P]. 中国发明专利, 专利号 CN 110478349 B, 授权公告日 2020-02-12.
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