2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((2-sulfo-4-((4-sulfophenyl)azo)phenyl)azo)- 25188-41-4 2610-10-8 7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((2-sulfo-4-((4-sulfophenyl)azo)phenyl) azo)-2-naphthalenesulfonic acid) C.I. direct red 80