8-Amino-1-hydroxy-(2,2'-azobisnaphthalene)-1',3,6-trisulfonic acid trisodium salt

trisodium 5-amino-4-hydroxy-3-[(1-sulphonato-2-naphthyl)azo]naphthalene-2,7-disulphonate

2,7-Naphthalenedisulfonic acid, 5-amino-4-hydroxy-3-[(1-sulfo-2-naphthalenyl)azo]-, trisodium salt

5-Amino-4-hydroxy-3-[[1-(sodiosulfo)-2-naphthalenyl]azo]-2,7-naphthalenedisulfonic acid disodium salt