发明人徐明华,郑宇鹏,罗永刚. "Method for the Synthesis of Diltiazem - Impurity C (Freebase)" [P]. 中国发明专利, 专利号 CN 117283344 B, 授权公告日 2019-03-24.
Davis P L, Yamamoto T, Stevens L M. "A Process for Preparing High-Purity Diltiazem - Impurity C (Freebase)" [P]. US Patent, US 11686939 B2, 2018-06-21.
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