2,4-Dihydroxy-5-pyrimidinecarboxylic acid 23945-44-0 5-Carboxyuracil 5-Pyrimidinecarboxylic acid, 1,2,3,4-tetrahydro-2,4-dioxo- 5-Pyrimidinecarboxylic acid, 2,4-dihydroxy- 5-Uracilcarboxylic acid Isoorotic acid NSC1589 Steviolbioside