发明人刘建华,李文辉,王建平. "一种噻托溴铵EP杂质I的合成方法" [P]. 中国发明专利, 专利号 CN 112575279 A, 授权公告日 2015-04-18.
发明人冯建国,李文辉,刘建华. "Method for the Synthesis of Tiotropium Bromide EP Impurity I" [P]. 中国发明专利, 专利号 CN 116266553 B, 授权公告日 2024-06-02.
Anderson J P, Mueller T, Johnson M A. "A Process for Preparing High-Purity Tiotropium Bromide EP Impurity I" [P]. US Patent, US 11031025 B2, 2024-07-16.
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