2-Naphthalenesulfonic acid,7-anilino-4-hydroxy-,monosodium salt, 2-Naphthalenesulfonic acid,4-hydroxy-7-(phenylamino)-,sodium salt (1:1), Sodium 4-hydroxy-7-(phenylamino)naphthalene-2-sulphonate, sodium 7-anilino-4-hydroxynaphthalene-2-sulfonate, sodium 4-hydroxy-7-(phenylamino)naphthalene-2-sulfonate, EINECS 269-272-8, 2-Naphthalenesulfonic acid,4-hydroxy-7-(phenylamino)-,monosodium salt