tetrasodium 2-[[8-[[[[3-[(2-chloroethyl)sulphonyl]phenyl]amino]carbonyl]amino]-1-hydroxy-3,6-disulphonato-2-naphthyl]azo]naphthalene-1,5-disulphonate

2-[[8-[[[[3-[(2-Chloroethyl)sulfonyl]phenyl]amino]carbonyl]amino]-1-hydroxy-3,6-bis(sodiooxysulfonyl)-2-naphthalenyl]azo]-1,5-naphthalenedisulfonic acid disodium salt