93891-85-1

5-[[[5(or 6)-[(2-chloroethyl)sulphonyl]bicyclo[2.2.1]hept-2-yl]carbonyl]amino]-4-hydroxy-3-[[4-[(2-methoxyphenyl)amino]-3-sulphophenyl]azo]naphthalene-2,7-disulphonic acid, sodium salt