5-hydroxy-6-(4-(5'-methylpyrimidine-2'-one)dihydrothymine)

4,5-Dihydro-5-hydroxy-5,5'-dimethyl-4,4'-bipyrimidine-2,2',6(1H,1'H,3H)-trione

5-Hydroxy-5-methyl-6-(2-oxo-5-methyl-1,2-dihydropyrimidine-4-yl)hexahydropyrimidine-2,4-dione