Synonyms: 4,6(1H,5H)-Pyrimidinedione,5-[5-(hexahydro-4,6-dioxo-2-thioxo-5-pyrimidinyl)-2,4-pentadienylidene]dihydro-2-thioxo-,monosodium salt (9CI); Sodium,[[5-[5-(4,6-dihydroxy-2-thioxo-5(2H)-pyrimidinylidene)-1,3-pentadienyl]-4,6-dihydroxy-2-pyrimidinyl]thio]-(7CI)