2-Naphthalenesulfonic acid, 6-hydroxy-5-[[4-[[[4-[(4-sulfophenyl)azo]phenyl]amino]carbonyl]phenyl]azo]-, disodium salt 2-Naphthalenesulfonic acid, 6-hydroxy-5-[[p-[[p-[(p-sulfophenyl)azo]phenyl]carbamoyl]phenyl]azo]-, disodium salt 2-Naphthol-6-sulfonic acid, 1-[[p-[[p-[(p-sulfophenyl)azo]phenyl]carbamoyl]phenyl]azo]-, disodium salt NSC79717