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发明人黄志刚,唐晓军,周伟. "A Process for Preparing High-Purity Tert-butyl 4,4-difluoro-1,7-diazaspiro[4.4]Nonane-7-carboxylate" [P]. 中国发明专利, 专利号 CN 108340534 B, 授权公告日 2018-04-21.
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