10-ethyl-3,8-dimethylbenzo[g]pteridine-2,4-dione

3,8,10-trimethylbenzo[g]pteridine-2,4-dione

6-[amino(2-phenylethyl)amino]-3-methyl-1H-pyrimidine-2,4-dione

6-(N-aminoanilino)-3-methyl-1H-pyrimidine-2,4-dione

3-methyl-6-(N,3,4-trimethylanilino)-1H-pyrimidine-2,4-dione