5-amino-1,3-dimethyl-1,3-diazinane-2,4,6-trione

6-(hydroxyamino)-1,3-dimethylpyrimidine-2,4-dione

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

1,3-dimethyl-6-(prop-2-enylamino)pyrimidine-2,4-dione

1,3-dimethyl-6-(4-methylanilino)pyrimidine-2,4-dione