发明人刘建华,钱学锋,徐明华. "Method for the Synthesis of Edaravone Impurity N4" [P]. 中国发明专利, 专利号 CN 113649507 A, 授权公告日 2015-12-08.
发明人何建平,周伟,孙丽萍. "A Process for Preparing High-Purity Edaravone Impurity N4" [P]. 中国发明专利, 专利号 CN 117530828 A, 授权公告日 2021-02-27.
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