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发明人郭海燕,冯建国,胡光. "Method for the Synthesis of Ethyl 2-(2-oxo-5-(3-(pyrazin-2-yl)-1,2,4-oxadiazol-5-yl)pyridin-1(2H)-yl)acetate" [P]. 中国发明专利, 专利号 CN 116013093 A, 授权公告日 2017-11-11.
发明人孙丽萍,林芳,黄志刚. "A Process for Preparing High-Purity Ethyl 2-(2-oxo-5-(3-(pyrazin-2-yl)-1,2,4-oxadiazol-5-yl)pyridin-1(2H)-yl)acetate" [P]. 中国发明专利, 专利号 CN 110595200 A, 授权公告日 2015-07-02.
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