茶碱

1,3,5-trimethyl-6-methylamino-1H-pyrimidine-2,4-dione

4-methyl-N-(phenanthridin-6-ylmethyl)benzenesulfonamide

1,3-dimethyl-5-(methyl-d)-6-(methylamino)pyrimidine-2,4(1H,3H)-dione

1,3-dimethyl-6-(methylamino)-5-nitrosopyrimidine-2,4-dione