发明人韩伟,唐晓军,王建平. "Method for the Synthesis of Norethisterone Acetate EP Impurity B" [P]. 中国发明专利, 专利号 CN 117055191 A, 授权公告日 2016-11-19.
发明人何建平,钱学锋,韩伟. "A Process for Preparing High-Purity Norethisterone Acetate EP Impurity B" [P]. 中国发明专利, 专利号 CN 109567774 A, 授权公告日 2017-10-09.
参考文献 Literature
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