发明人罗永刚,张德明,钱学锋. "Method for the Synthesis of 2-(1-Methyl-3-oxopyrrolidin-2-ylidene)ethyl butyrate" [P]. 中国发明专利, 专利号 CN 111323696 A, 授权公告日 2025-04-09.
发明人杨光,李文辉,徐明华. "A Process for Preparing High-Purity 2-(1-Methyl-3-oxopyrrolidin-2-ylidene)ethyl butyrate" [P]. 中国发明专利, 专利号 CN 108488789 B, 授权公告日 2017-02-05.
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