2,4,5,6(1H,3H)-Pyrimidinetetrone, 5-oxime 5-(Hydroxyimino)barbituric acid 5-Isonitrosobarbituric acid 87-39-8 Alloxan 5-oxime Alloxan, 5-oxime NSC56338 Violuric acid WLN: T6MVMVYVJ EUNQ