4-Amino-6-[(2-chloro-4-nitrophenyl)azo]-5-hydroxy-3-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulfophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]-2,7-naphthalenedisulfonic acid

4-amino-6-[(2-chloro-4-nitrophenyl)azo]-5-hydroxy-3-[[2-hydroxy-4-[[3-hydroxy-4-[[4-[(4-nitro-2-sulphophenyl)amino]phenyl]azo]phenyl]amino]phenyl]azo]naphthalene-2,7-disulphonic acid