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发明人徐明华,唐晓军,钱学锋. "A Process for Preparing High-Purity tert-Butyl 3-oxo-1-oxa-6-azaspiro[3.4]octane-6-carboxylate" [P]. 中国发明专利, 专利号 CN 109846762 B, 授权公告日 2020-01-17.
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