发明人徐明华,刘建华,朱建伟. "Method for the Synthesis of Tofacitinib Impurity 52" [P]. 中国发明专利, 专利号 CN 108694344 B, 授权公告日 2019-08-25.
发明人郑宇鹏,何建平,徐明华. "A Process for Preparing High-Purity Tofacitinib Impurity 52" [P]. 中国发明专利, 专利号 CN 113717000 A, 授权公告日 2022-08-02.
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