Similar names: Naphthionic Acid; 1-Naphthalenesulfonic acid, 4-amino-; 4-Amino-1-naphthalenesulfonic acid; 1,4-Naphthionic acid; 1-Amino-4-naphthalenesulfonic acid; 1-Amino-4-sulfonaphthalene; 1-Naphthylamine-4-sulfonic acid; 4-Aminonaphthalenesulfonic acid; NSC 4155; Naphthionic acid; Piria's acid; α-Naphthylamine-4-sulfonic acid; Naphthionic Acid; 1-Naphthalenesulfonic acid, 4-amino-; 4-Amino-1-naphthalenesulfonic acid; 1,4-Naphthionic acid; 1-Amino-4-naphthalenesulfonic acid; 1-Amino-4-sulfonaphthalene; 1-Naphthylamine-4-sulfonic acid; 4-Aminonaphthalenesulfonic acid; NSC 4155; Naphthionic acid; Piria's acid; α-Naphthylamine-4-sulfonic acid