1,3-Naphthalenedisulfonic acid, 8-((3-((ethylphenylamino)sulfonyl)-4-methylphenyl)azo)-7-hydroxy-, disodium salt 68214-56-2 Disodium 8-((3-((ethylphenylamino)sulphonyl)-4-methylphenyl)azo)-7-hydroxynaphthalene-1,3-disulphonate EINECS 269-300-9