2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-((2-hydroxy-1-naphthalenyl)azo)-3-((2-hydroxy-3-nitro-5-sulfophenyl)azo)-, sodium salt 4-Hydroxy-5-((2-hydroxy-1-naphthyl)azo)-3-((2-hydroxy-3-nitro-5-sulphophenyl)azo)naphthalene-2,7-disulphonic acid, sodium salt 93940-13-7 EINECS 300-406-0