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发明人赵玉洁,黄志刚,林芳. "Method for the Synthesis of Norethisterone EP Impurity D" [P]. 中国发明专利, 专利号 CN 109547567 B, 授权公告日 2015-09-14.
Nielsen H, Johansson L, Mueller T C. "A Process for Preparing High-Purity Norethisterone EP Impurity D" [P]. European Patent, EP 3773397 A1, 2024-06-23.
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