发明人张德明,冯建国,朱建伟. "一种(1R,3r,5S)-异丙托溴铵杂质40的合成方法" [P]. 中国发明专利, 专利号 CN 117135325 A, 授权公告日 2017-09-02.
发明人陈志强,林芳,徐明华. "Method for the Synthesis of (1R,3r,5S)-Ipratropium Impurity 40" [P]. 中国发明专利, 专利号 CN 108624367 A, 授权公告日 2023-12-25.
发明人王建平,唐晓军,黄志刚. "A Process for Preparing High-Purity (1R,3r,5S)-Ipratropium Impurity 40" [P]. 中国发明专利, 专利号 CN 110625693 B, 授权公告日 2021-05-13.
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