4,4'-DIHEPTYLAZOXYBENZENE

4,4'-DIHYDROXYDIPHENYLMETHANE

4,4'-Diisothiocyanatodihydrostilbene-2,2'-disulfonicaciddisodiumsalt

4,4'-DIMETHOXY-N-METHYLDIPHENYLAMINE

4,4'-Dimethylbenzophenone

4,4'-Dinitrodiphenyl disulfide

4,4'-Dinitrodiphenyl disulfide

4,4'-DIPENTYLAZOXYBENZENE

4,4'-Diphenoxybenzophenone

4',4''(5'')-DI-TERT-BUTYLDIBENZO-18-CROWN-6