6-p-toluidinonaphthalene-2-sulfonic acid, 6-p-Toluidinonaphthalene-2-sulphonic acid, 2-Naphthalenesulfonic acid,6-[(4-methylphenyl)amino], 2-(p-Toluidinyl)naphthalene-6-sulfonic acid, 2-(p-toluidinyl)naphthalene-6-sulfonate, 6-[(4-methylphenyl)amino]naphthalene-2-sulfonic acid, 6-(p-Toluidino)-2-naphthalene sulfonic acid, 2-(4-Toluidino)-6-naphthalenesulfonic acid, 2-(p-toluidinyl)naphtalene-6-sulfonic acid