1,7-Naphthalenedisulfonic acid, 4-(benzoylamino)-5-hydroxy-6-((1-sulfo-6-((2-(sulfooxy)ethyl)sulfonyl)-2-naphthalenyl)azo)-, tetrasodium salt 82199-13-1 EINECS 279-915-4 Tetrasodium 4-(benzoylamino)-5-hydroxy-6-((1-sulphonato-6-((2-(sulphonatooxy)ethyl)sulphonyl)-2-naphthyl)azo)naphthalene-1,7-disulphonate