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发明人徐明华,刘建华,孙丽萍. "A Process for Preparing High-Purity 4-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-1-(2,4-difluorobenzyl)piperidine-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 109026446 B, 授权公告日 2018-11-08.
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