发明人徐明华,罗永刚,王建平. "Method for the Synthesis of Oxiracetam Impurity 21" [P]. 中国发明专利, 专利号 CN 112340587 A, 授权公告日 2022-10-16.
发明人李文辉,唐晓军,黄志刚. "A Process for Preparing High-Purity Oxiracetam Impurity 21" [P]. 中国发明专利, 专利号 CN 113969077 A, 授权公告日 2022-10-15.
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