发明人周伟,徐明华,韩伟. "Method for the Synthesis of Ensifentrine impurity 6" [P]. 中国发明专利, 专利号 CN 112717404 A, 授权公告日 2020-12-27.
发明人郑宇鹏,罗永刚,高志强. "A Process for Preparing High-Purity Ensifentrine impurity 6" [P]. 中国发明专利, 专利号 CN 109415974 B, 授权公告日 2022-02-04.
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