3,4,5,7-Tetrahydro-1,3,7-trimethyl-10-anti,11-syn-diphenyl-4,5-ethano-1H-purin-2,6-dion

1,3-Dimethyl-5,6-diphenylpyrido<2,3-d>pyrimidin-2,4(1H,3H)-dion

8-amino-1,3,7-trimethylpurine-2,6-dione

8-(morpholin-4-yl)quinoline-5,6-dione

1,3,7-trimethyl-8-(2-phenylethoxy)purine-2,6-dione