1h purine 2 6 dione 3 7 dihydro 1 3 7 trimethyl July 8, 2019 16 32 64 128 1h-purine-2 6-dione 3 7-dihydro-1 3 7-trimethyl- 3 7-dihydro-1 3-dimethyl-1h-purine-2 6-dione 3 7-dihydro-3 7-dimethyl-1h-purine-2 6-dione 3 7-dihydro-1h-purine-2 6-dione
