5-[[4-[(4-Sulfophenyl)-ONN-azoxy]phenyl]azo]-2-[2-[2-sulfo-4-[[4-[(4-sulfophenyl)-ONN-azoxy]phenyl]-ONN-azoxy]phenyl]ethenyl]benzenesulfonic acid tetrasodium salt
72869-20-6 2-[2-[2-Sulfo-4-[[4-[(4-sulfophenyl)azo]phenyl]azo]phenyl]ethenyl]-5-[[4-[(4-sulfophenyl)azo]phenyl]-ONN-azoxy]benzenesulfonic acid tetrasodium salt