2,7-Naphthalenedisulfonic acid, 5-(acetylamino)-4-hydroxy-3-((3-phosphonophenyl)azo)-, disodium salt 5-(Acetylamino)-4-hydroxy-3-((3-phosphonophenyl)azo)-2,7-naphthalenedisulfonic acid, disodium salt 68110-24-7 89591-46-8 Disodium hydrogen 5-acetamido-4-hydroxy-3-((m-phosphonatophenyl)azo)naphthalene-2,7-disulphonate EINECS 268-512-9