1,4-DIAMINO-2,3-DICYANO-9,10-ANTHRAQUINONE

1,4-DIBENZYLOXY-2-NITROBENZENE

1,4-DIDEOXY-1,4-IMINO-D-MANNITOL HYDROCHLORIDE

1,4-DIHYDROXY-3,3,6,6-TETRAMETHYLPIPERAZINE-2,5-DIONE

1,4-DIIODO-2,5-DIMETHOXYBENZENE

1,4-DIIODOTETRAFLUOROBENZENE