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

4-Amino-3-[(2-chlorophenyl)azo]-5-hydroxy-6-[[4-(phenylazo)phenyl]azo]-2,7-naphthalenedisulfonic acid/sodium,(1:x) salt