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发明人孙丽萍,周伟,钱学锋. "A Process for Preparing High-Purity tert-Butyl 3-(2-ethoxy-2-oxoethyl)-6-methoxy-2,3-dihydrospiro[indene-1,4'-piperidine]-1'-carboxylate" [P]. 中国发明专利, 专利号 CN 111622686 A, 授权公告日 2020-10-28.
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