1-Amino-5-naphthalenesufonic acid 1-Amino-5-sulfonaphthalene 1-Naphthalenesulfonic acid, 5-amino- 1-Naphthylamine-5-sulfonic acid 4-Amino-1-naphthalenesulfonic acid 5-Amino-1-naphthalenesulfonic acid 5-Naphthylamine-1-sulfonic acid 84-89-9 Laurent acid NSC7553