2-Naphthalenesulfonic acid, 4-hydroxy-7-(phenylamino)-, monosodium salt 2-Naphthalenesulfonic acid, 7-anilino-4-hydroxy-, monosodium salt 68213-89-8 EINECS 269-272-8 Sodium 4-hydroxy-7-(phenylamino)naphthalene-2-sulphonate