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

4,4'-DIMETHOXY-N-METHYLDIPHENYLAMINE

4,4-DIMETHYL-1-PHENYLPENTANE-1,3-DIONE

4,4-DIMETHYL-2-CYCLOHEXEN-1-ONE

4,4-DIMETHYL-2-PHENYL-2-OXAZOLINE

4,4-DIPHENYLSEMICARBAZIDE

4,4'-DIPYRIDYL DIHYDROCHLORIDE

4,4'-DI-TERT-BUTYLBIPHENYL