5,6-DIAMINO-2,4-DIHYDROXYPYRIMIDINE SULFATE DIHYDRATE

5,6-DICHLORO-2,3-DICYANOPYRAZINE

5,6-DIHYDRO-2-ISOPROPENYL-4,4,6-TRIMETHYL-1,3(4H)-OXAZINE

3-AMINO-5,6-DIPHENYL-1,2,4-TRIAZINE

5,6-DIPHENYL-2,3-DIHYDROPYRAZINE

5,6-DIPHENYL-2,3-DIHYDROPYRAZINE

5,7-Dihydro-2-methylthieno[3,4-d]pyrimidine

5,7-DIMETHYLPYRIDO[2,3-D]PYRIMIDIN-4(3H)-ONE