发明人刘建华,张德明,马晓峰. "Method for the Synthesis of Hydantoin Impurity 3" [P]. 中国发明专利, 专利号 CN 113201909 B, 授权公告日 2016-04-04.
发明人李文辉,刘建华,马晓峰. "A Process for Preparing High-Purity Hydantoin Impurity 3" [P]. 中国发明专利, 专利号 CN 116754929 A, 授权公告日 2019-01-08.
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