2-Naphthalenesulfonic acid, 7-((4-aminobenzoyl)amino)-4-hydroxy-, monosodium salt 67786-17-8 7-(4-Aminobenzamido)-4-hydroxy-2-naphthalene sulfonic acid, sodium salt EINECS 267-092-4 Sodium 7-((4-aminobenzoyl)amino)-4-hydroxynaphthalene-2-sulphonate