65072-31-3 Benzoic acid, 4,4'-(carbonylbis(imino(1-hydroxy-3-sulfo-6,2-naphthalenediyl)azo))bis-, tetrasodium salt Benzoic acid, 4,4'-(ureylenebis((1-hydroxy-3-sulfo-6,2-naphthylene)azo))di-, tetrasodium salt EINECS 265-366-8 Tetrasodium 4,4'-(carbonylbis(imino(1-hydroxy-3-sulphonatonaphthalene-6,2-diyl)azo))dibenzoate