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发明人孙丽萍,钱学锋,郭海燕. "A Process for Preparing High-Purity 4-((4-(Dimethylamino)phenyl)amino)-4-oxobut-2-enoic acid" [P]. 中国发明专利, 专利号 CN 115686509 B, 授权公告日 2023-03-11.
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