发明人冯建国,沈红梅,张德明. "Method for the Synthesis of Tiotropium EP Impurity A" [P]. 中国发明专利, 专利号 CN 116457379 B, 授权公告日 2024-02-26.
Chen K W, Stevens L M, Lee S K. "A Process for Preparing High-Purity Tiotropium EP Impurity A" [P]. US Patent, US 10923876 B2, 2018-04-06.
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