5-[5-(1,3-diethyl-1,2,3,4-tetrahydro-6-hydroxy-2,4-dioxo-5-pyrimidinyl)penta-2,4-dienylidene]-1,3-diethylbarbituric acid

5-[5-[(1,3-Diethyl-1,2,3,4-tetrahydro-6-hydroxy-2,4-dioxopyrimidin)-5-yl]-2,4-pentadienylidene]-1,3-diethyl-2,4,6(1H,3H,5H)-pyrimidinetrione