1 3-dimethyl-3 4 5 6-tetrahydro-2(1h)-pyrimidinone July 8, 2019 16 32 64 128 1 3 7-trimethyl-3 4 5 7-tetrahydro-1h-purine-2 6-dione 3 4-dihydro- 4 4 6-trimethyl-2(1h)-pyrimidone 1 3-dimethylpyrimidine-2 4 6(1h 3h 5h)-trione 1 3 7-trimethyl-2 3 6 7-tetrahydro-1h-purine-2 6-dione
