disodium 4-[[5-[(3-amino-4-nitrophenyl)azo]-2,4-dihydroxyphenyl]azo]-5-hydroxynaphthalene-2,7-disulphonate

4-[[5-[(3-Amino-4-nitrophenyl)azo]-2,4-dihydroxyphenyl]azo]-5-hydroxy-2,7-naphthalenedisulfonic acid disodium salt

2,7-Naphthalenedisulfonic acid, 4-[[5-[(3-amino-4-nitrophenyl) azo]-2,4-dihydroxyphenyl]azo]-5-hydroxy-, disodium salt