2,2'-BICINCHONINIC ACID

4,4'-Dichlorobenzophenone

4,4'-DICHLOROBUTYROPHENONE

4,4'-DIETHYNYLDIPHENYLMETHANE

4,4'-Difluorodiphenylmethane

4,4'-DIHYDROXYDIPHENYLMETHANE

4,4-DIMETHYLOXAZOLIDINE

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

4,4-Dimethyl-2-pentyne