.alpha.-Naphthylamine-p-sulfonic acid, monosodium salt 1,4-Naphthionic monosodium salt 1-Naphthalenesulfonic acid, 4-amino-, monosodium salt 130-13-2 4-Amino-1-naphthalene sulfonic acid, sodium salt 4-Amino-1-napthalene sulfonic acid, sodium salt NSC168 Naphthemol Naphthionine Sodium .alpha.-naphthylamine-4-sulfonate Sodium 1-aminonaphthalene-4-sulfonate Sodium 1-naphthylamine-4-sulfonate Sodium naphthionate