134-47-4 2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy- 2-Naphthalenesulfonic acid, 7,7'-ureylenebis(4-hydroxy- (8CI) 4,4'-Dihydroxy-7,7'-ureylenedi(naphthalene-2-sulphonic acid) 6,6'-Ureylenebis(1-naphthol-3-sulfonic acid) Carbonyl J Acid EINECS 205-142-9 I Acid Urea J Acid urea N,N'-Bis(1-hydroxy-3-sulfonaphthyl(6))urea N,N'-Bis(1-oxy-3-sulfonaphthyl(6))urea NSC 1699 Urea J Acid