134-47-4 2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis[4-hydroxy- 2-Naphthalenesulfonic acid, 7,7'-ureylenebis[4-hydroxy- 6,6'-Ureylenebis(1-naphthol-3-sulfonic acid) Carbonyl J Acid I Acid Urea J Acid urea N,N'-Bis[1-hydroxy-3-sulfonaphthyl(6)]urea N,N'-Bis[1-oxy-3-sulfonaphthyl(6)]urea NSC45174 Urea J Acid