Thoron I

1-(o-Arsonophenylazo)-2-naphthol-3,6-disulfonic acid,sodium salt

1-(o-Arsonophenylazo)-2-naphthol-3,6-disulfonic acid, sodium salt

trisodium 4-[(o-arsonophenyl)azo]-3-oxidonaphthalene-2,7-disulphonate

2,7-Naphthalenesulfonic acid,4-(2-arsonophenyl)azo)-3-hydroxy-,trisodium salt

2,7-Naphthalenesulfonic acid, 4-(2-arsonophenyl)azo)-3-hydroxy-, trisodium salt