Synonyms: 1(2H)-Pyrimidineacetic acid, 3-butyl-5-(5-(1-butyl-3-(carboxymethyl)hexahydro-2,4,6-trioxo-5-pyrimidinyl)-2,4-pentadien-1-ylidene)tetrahydro-2,4,6-trioxo-, ion(1-), sodium, sodium salt (1:1:2);1(2H)-Pyrimidineacetic acid, 3-butyl-5-(5-(1-butyl-3-(carboxymethyl)hexahydro-2,4,6-trioxo-5-pyrimidinyl)-2,4-pentadienylidene)tetrahydro-2,4,6-trioxo-, ion(1-), sodium, disodium salt;Trisodium 3-butyl-5-(5-(1-butyl-3-(carboxylatomethyl)-1,2,3,4-tetrahydro-6-oxido-2,4-dioxo-5-pyrimidinyl)penta-2,4-dienylidene)tetrahydro-2,4,6-trioxo-2H-pyrimidine-1-acetate;trisodium [3-butyl-5-{5-[3-butyl-1-(carboxylatomethyl)-6-oxido-2,4-dioxo-1,2,3,4-tetrahydropyrimidin-5-yl]penta-2,4-dien-1-ylidene}-2,4,6-trioxotetrahydropyrimidin-1(2H)-yl]acetate