发明人刘建华,冯建国,朱建伟. "Method for the Synthesis of Glycopyrrolate Impurity 4" [P]. 中国发明专利, 专利号 CN 111424194 B, 授权公告日 2019-03-09.
发明人何建平,郭海燕,钱学锋. "A Process for Preparing High-Purity Glycopyrrolate Impurity 4" [P]. 中国发明专利, 专利号 CN 114532870 A, 授权公告日 2023-01-20.
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