5,6-dihydrouracil2,4(1H,3H)-Pyrimidinedione, dihydro-2,4-Dioxotetrahydropyrimidine5,6-Dihydro-2,4-dihydroxypyrimidine5,6-Dihydrouracil5,6-dihydrouracilDIHYDROPYRIMIDINE-2,4(1H,3H)-DIONEDihydro-2,4(1H,3H)-pyrimidinedioneDihydrouracilDihydrouracileHydrouracil