Isobarbituric Acid, 5-Hydroxyuracil, 2,4,5-Trihydroxypyrimidine, 2,4,6-ThihydroxypyriMidine, Fluorouracil impurity B, 5-hydroxyisouracil, TRIFLUOROACETIC ACID REAGENTPLUS, 2,4,5(3H)-Pyrimidinetrione, dihydro-, Isobarbitursaeure, 2,4,5-Trihydroxypyrimidine,5-Hydroxyuracil,Isobarbituric acid