1-N',2-N'-diphenylethanediimidamide

4-[[4-(dimethylamino)naphthalen-1-yl]diazenyl]benzenesulfonic acid

4-(4-amino-5,6,7,8-tetrahydro-[1]naphthylazo)-benzenesulfonic acid

4-(benzoylamino)-Benzenesulfonic acid

4-[(2,4-diaminophenyl)diazenyl]benzenesulfonic acid