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发明人王建平,孙丽萍,李文辉. "A Process for Preparing High-Purity Ethyl 3-(6-chloro-4-methoxypyridazin-3-yl)-3-oxopropanoate" [P]. 中国发明专利, 专利号 CN 111406486 B, 授权公告日 2020-06-14.
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