(4,4'-Bipyrimidine)-2,2',6(1H,1'H,3H)-trione, 4,5-dihydro-5-hydroxy-5,5'-dimethyl- 151516-15-3 20545-93-1 23287-04-9 5-Hydroxy-6-(4-(5'-methylpyrimidine-2'-one)dihydrothymine) HMPDT