Synonyms: 5-Pyrimidinecarboxylicacid, 2,4-dihydroxy- (8CI);2,4-Dioxo-1,2,3,4-tetrahydropyrimidine-5-carboxylicacid;5-Carboxyuracil;5-Uracilcarboxylicacid;Isoorotic acid;NSC 1589;NSC 79561;2,4-Dihydroxypyrimidine-5-carboxylic acid;2,4-Dioxo-1,2,3,4-tetrahydro-5-pyrimidinecarboxylic acid;