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发明人李文辉,马晓峰,胡光. "A Process for Preparing High-Purity 5-(Pyridin-4-yl)-1,2,4-oxadiazole-3-carboxylic acid" [P]. 中国发明专利, 专利号 CN 108959711 A, 授权公告日 2021-09-14.
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