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发明人郑宇鹏,钱学锋,李文辉. "A Process for Preparing High-Purity 3999-67-5
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tetramethyl 1,2,3,4-cyclobutanetetracarboxylate" [P]. 中国发明专利, 专利号 CN 115331999 B, 授权公告日 2019-07-08.
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