发明人张德明,郭海燕,刘建华. "一种伐尼克兰杂质70的合成方法" [P]. 中国发明专利, 专利号 CN 117370284 A, 授权公告日 2023-01-08.
Lefèvre J P, Jørgensen K, Nowak P. "Method for the Synthesis of Varenicline Impurity 70" [P]. European Patent, EP 3824188 A1, 2022-03-04.
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