1-Naphthalenesulfonic acid, 5,5'-(carbonylbis(imino(1-hydroxy-3-sulfo-6,2-naphthalenediyl)azo))bis-, tetrasodium salt 6410-42-0 C.I. Direct Red 54 EINECS 229-108-8 Tetrasodium 5,5'-(carbonylbis(imino(1-hydroxy-3-sulphonatonaphthalene-2,6-diyl)azo))bisnaphthalene-1-sulphonate