disodium 5-[[4-[(4-nitro-2-sulphonatophenyl)amino]phenyl]azo]-8-[[4-[(phenylsulphonyl)oxy]phenyl]azo]naphthalene-2-sulphonate

2-Naphthalenesulfonic acid, 5-[[4-[(4-nitro-2-sulfophenyl) amino]phenyl]azo]-8-[[4-[(phenylsulfonyl)oxy ]phenyl]azo]-, disodium salt

5-[[4-[[4-Nitro-2-(sodiooxysulfonyl)phenyl]amino]phenyl]azo]-8-[[4-[(phenylsulfonyl)oxy]phenyl]azo]-2-naphthalenesulfonic acid sodium salt