发明人张德明,郑宇鹏,冯建国. "Method for the Synthesis of Gemcitabine Impurity N19" [P]. 中国发明专利, 专利号 CN 109276353 A, 授权公告日 2020-03-02.
发明人张德明,朱建伟,罗永刚. "A Process for Preparing High-Purity Gemcitabine Impurity N19" [P]. 中国发明专利, 专利号 CN 114964933 A, 授权公告日 2022-02-24.
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