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发明人冯建国,李文辉,马晓峰. "Method for the Synthesis of Ethyl 4-((4-oxo-3,5,6,7-tetrahydro-4H-cyclopenta[4,5]thieno[2,3-d]pyrimidin-2-yl)thio)butanoate" [P]. 中国发明专利, 专利号 CN 111445746 A, 授权公告日 2017-04-09.
发明人孙丽萍,黄志刚,王建平. "A Process for Preparing High-Purity Ethyl 4-((4-oxo-3,5,6,7-tetrahydro-4H-cyclopenta[4,5]thieno[2,3-d]pyrimidin-2-yl)thio)butanoate" [P]. 中国发明专利, 专利号 CN 108063980 B, 授权公告日 2024-02-17.
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