发明人陈志强,周伟,钱学锋. "一种维拉帕米EP杂质I的合成方法" [P]. 中国发明专利, 专利号 CN 117818852 A, 授权公告日 2020-02-03.
发明人唐晓军,杨光,徐明华. "Method for the Synthesis of Verapamil EP Impurity I" [P]. 中国发明专利, 专利号 CN 114492310 A, 授权公告日 2022-04-20.
发明人王建平,徐明华,赵玉洁. "A Process for Preparing High-Purity Verapamil EP Impurity I" [P]. 中国发明专利, 专利号 CN 108937449 A, 授权公告日 2021-09-21.
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