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发明人郭海燕,钱学锋,赵玉洁. "A Process for Preparing High-Purity 1,3-Dimethyl-4-(methylamino)-2,5-dioxoimidazolidine-4-carboxylic acid" [P]. 中国发明专利, 专利号 CN 110239218 A, 授权公告日 2021-09-01.
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