发明人李文辉,马晓峰,徐明华. "Method for the Synthesis of Hydantoin Impurity 31" [P]. 中国发明专利, 专利号 CN 113286077 A, 授权公告日 2022-01-26.
Stevens L M, O'Brien P Q, Williams B T. "A Process for Preparing High-Purity Hydantoin Impurity 31" [P]. US Patent, US 11549244 B2, 2022-11-24.
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