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

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

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