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

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