4-amino-3-[[4-[[[4-[(2,4-diaminophenyl)azo]phenyl]amino]carbonyl]phenyl]azo]-5-hydroxy-6-(phenylazo)naphthalene-2,7-disulphonic acid, sodium salt

2,7-Naphthalenedisulfonic acid, 4-amino-3-[[4-[[[4-[(2,4- diaminophenyl)azo]phenyl]amino]carbonyl]phenyl]azo ]-5-hydroxy-6-(phenylazo)-, sodium salt