4’-氨基偶氮苯-4-磺酸

4-(4-nitro-phenylazo)-benzenesulfonic acid

2-nitro-4-(4'-sulfophenylazo)-phenol

2-羟基-5-[(4-磺基苯基)偶氮]苯甲酸

4-[(2-羟基-1-萘基)偶氮]苯磺酸