1,4-Naphthionic acid 1-Amino-4-sulfonaphthalene 1-Aminonaphthalene-4-sulfonic acid 1-Naphthalenesulfonic acid, 4-amino- 1-Naphthylamin-4-sulfonsaeure 1-Naphthylamine-4-sulfonic acid 130-13-2 4-AMINO-1-NAPHTHALENESULFONIC ACID 4-Amino-1-naphthalinsulfonsaeure 4-Aminonaphthalene-1-sulphonic acid 84-86-6 AI3-52278 EINECS 201-567-9 Kyselina 1-naftylamin-4-sulfonova [Czech] Kyselina nafthionova [Czech] NSC 4155 Naphthionic acid Naphthionsaeure Piria's acid Sulfonaphtin USAF M-5 alpha-Naphthylamine-4-sulfonic acid alpha-Naphthylamine-p-sulfonic acid