Björnsson E, Jørgensen K, Mueller T C. "一种左西孟旦杂质56的合成方法" [P]. European Patent, EP 3039961 A1, 2018-12-02.
发明人王建平,罗永刚,徐明华. "Method for the Synthesis of Levosimendan Impurity 56" [P]. 中国发明专利, 专利号 CN 114374133 B, 授权公告日 2025-09-21.
发明人罗永刚,孙丽萍,郑宇鹏. "A Process for Preparing High-Purity Levosimendan Impurity 56" [P]. 中国发明专利, 专利号 CN 111270163 B, 授权公告日 2019-08-14.
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