4-amino-6-[[4-[[4-[[4-(diethylamino)-2-hydroxyphenyl]azo]phenyl]amino]-3-sulphophenyl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]naphthalene-2,7-disulphonic acid, sodium salt

4-Amino-6-[[4-[[4-[[4-(diethylamino)-2-hydroxyphenyl]azo]phenyl]amino]-3-sulfophenyl]azo]-5-hydroxy-3-[(4-nitrophenyl)azo]-2,7-naphthalenedisulfonic acid/sodium,(1:x) salt