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

2-[[2-Amino-6-[[ethyl(4-sulfophenyl)amino]sulfonyl]-8-hydroxynaphthalen-1-yl]azo]benzenesulfonic acid 1-[4-[(chloroacetyl)amino]phenyl] ester