发明人郭海燕,王建平,朱建伟. "Method for the Synthesis of Nicardipine Impurity 56" [P]. 中国发明专利, 专利号 CN 108776166 B, 授权公告日 2021-01-14.
发明人冯建国,张德明,郑宇鹏. "A Process for Preparing High-Purity Nicardipine Impurity 56" [P]. 中国发明专利, 专利号 CN 113079890 A, 授权公告日 2017-02-23.
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