1,3-dimethyl-5,7-diphenylpyrido[2,3-d]pyrimidine-2,4-dione

6-azido-1,3-dimethylpyrimidine-2,4-dione

5,5-bis(1,3-dimethyl-2,4,6-trioxo-1,3-diazinan-5-yl)-1,3-dimethyl-1,3-diazinane-2,4,6-trione

1,3,7,9-tetramethylpyrimido[5,4-g]pteridine-2,4,6,8-tetrone

3-methyl-1-(4-nitrobenzyl)pyridin-1-ium bromide