发明人冯建国,周伟,高志强. "Method for the Synthesis of Dienogest EP Impurity I" [P]. 中国发明专利, 专利号 CN 113173602 A, 授权公告日 2017-02-23.
Park J H, Johnson M A, Stevens L M. "A Process for Preparing High-Purity Dienogest EP Impurity I" [P]. US Patent, US 10441439 B2, 2018-01-16.
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