4,4'-Dichlorodiphenyl sulfone

4,4'-DIHEPTYLAZOXYBENZENE

4,4'-Dihydroxybenzophenone

4,4'-DIISOCYANATO-3,3',5,5'-TETRAETHYLDIPHENYLMETHANE

4,4-DIMETHYL-2-VINYL-2-OXAZOLIN-5-ONE

4,4'-DIMETHYLOCTAFLUOROBIPHENYL

4,4'-Dinitrostilbene-2,2'-disulfonic acid

4,4'-DIPYRIDYL DIHYDROCHLORIDE