1,7-Cleve's acid 1-Amino-7-naphthalenesulfonic acid 1-Amino-7-sulfonaphthalene 1-Aminonaphthalene-7-sulfonic acid 1-Naphthylamine-7-sulfonic acid 119-28-8 2-Naphthalenesulfonic acid, 8-amino- 8-Amino-2-naphthalenesulfonic acid 8-Naphthylamine-2-sulfonic acid C.I. 26135 Cleve's .theta.-acid NSC4983