Methylenedisalicylic acid

5,6,11,12-Tetrathiotetracene

5,6-DIHYDRO-2H-PYRAN-2-ONE

5,6-DIHYDROXY-7-METHOXYFLAVONE

5,6-Dimethylbenzimidazole

5,7-BIS(TRIFLUOROMETHYL)-2-(METHYLTHIO)PYRAZOLO-[1,5-A]PYRIMIDINE-3-CARBOXAMIDE

5,7-DIBROMO-8-HYDROXYQUINOLINE

5,7-Diiodo-8-quinolinol