发明人王建平,杨光,林芳. "一种左西孟旦杂质52的合成方法" [P]. 中国发明专利, 专利号 CN 115429311 A, 授权公告日 2020-10-28.
Patel M V, Williams B T, Schröder R. "Method for the Synthesis of Levosimendan Impurity 52" [P]. US Patent, US 9382325 B2, 2018-08-15.
Lee S K, Kumar R, Roberts E F. "A Process for Preparing High-Purity Levosimendan Impurity 52" [P]. US Patent, US 9216966 B2, 2021-05-21.
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