Sodium 4-[(4-hydroxy-1-naphthyl)azo]benzenesulphonate

4-(4-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt, Tropaeolin 000 No.1, oranzi, DAIDAI402, c.i.150, Tropaeolin OOO-1, ORANGE1, Acid Orange 20, orangeim, oranges, Orange I, α-Naphthol orange, Sodium 4-((4-hydroxynaphthalen-1-yl)diazenyl)benzenesulfonate