4-溴苯磺酸

4-[(4-diazoniophenyl)diazenyl]benzenesulfonate

4-巯基苯磺酸

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

4-[2-(2,6-dioxopurin-8-yl)hydrazinyl]benzenesulfonic acid