发明人周伟,罗永刚,赵玉洁. "一种依达拉奉杂质21的合成方法" [P]. 中国发明专利, 专利号 CN 110173957 A, 授权公告日 2017-06-19.
发明人陈志强,杨光,郑宇鹏. "Method for the Synthesis of Edaravone Impurity 21" [P]. 中国发明专利, 专利号 CN 117555912 A, 授权公告日 2016-03-24.
发明人李文辉,胡光,王建平. "A Process for Preparing High-Purity Edaravone Impurity 21" [P]. 中国发明专利, 专利号 CN 108052377 A, 授权公告日 2018-07-17.
参考文献 Literature
Fischer P, Wagner E. "Development and Validation of an LC-MS/MS Method for the Determination of 依达拉奉杂质21 in Pharmaceutical Formulations". J. Nat. Prod., 2022, 1501, (8), 7835-7861.
Kumar A, Sharma P, Patel R S. "A Stability-Indicating HPLC Method for the Separation and Quantification of 依达拉奉杂质21 as an Impurity". Molecules, 2019, 184, 8204-8220.
Mueller T, Schmidt R K. "Identification and Structural Characterization of a Novel Degradation Product of Edaravone Impurity 21 Using HRMS and NMR". Anal. Methods, 2025, 2234, (8), 2454-2478.