2-(2-Arsonophenylazo)-7-(2-carboxyphenylazo)chromotropic acid

2-[[7-[(2-arsonophenyl)azo]-1,8-dihydroxy-3,6-disulpho-2-naphthyl]azo]benzoic acid

6-(2-Arsonophenylazo)-3-(2-carboxyphenylazo)-4,5-dihydroxynaphthalene-2,7-disulfonic acid