1 2-DI-(4-PYRIDYL)-1 2-ETHANEDIOL

1,2-DIAMINOANTHRAQUINONE

TRANS-1,2-DIBENZOYLETHYLENE

1,2-DIBROMOHEXAFLUOROPROPANE

1,2-DIBROMO-3,5-DIFLUOROBENZENE

1,2-DICHLORO-1-FLUOROETHYLENE

1,2-DICHLOROHEXAFLUOROCYCLOBUTANE