sodium 1-[4-(chloroacetamido)phenyl] 2-[[2-amino-6-[[ethyl(4-sulphonatophenyl)amino]sulphonyl]-8-hydroxy-1-naphthyl]azo]benzenesulphonate

2-[[2-Amino-6-[[ethyl(4-sodiosulfophenyl)amino]sulfonyl]-8-hydroxy-1-naphthalenyl]azo]benzenesulfonic acid 4-[(chloroacetyl)amino]phenyl ester