紫脲酸 ,英文名称为5-hydroxyiminobarbituric acid,中文别名为1,3-二甲基-4-亚氨基-5-异亚硝基脲嗪,CAS号为87-39-8,分子式为C4H3N3O4,是一种化工中间体。5-Isonitrosobarbituric acid; 2,4,5,6(1H,3H)-Pyrimidinetetrone,5-oxime; Violuric acid;alloxan,5-oxime; violuric acid hydrate; pyrimidine-2,4,5,6(1H,3H)-tetrone 5-oxime