pentasodium 2-[[1-hydroxy-3,6-disulphonato-8-[[3-[[2-(sulphonatooxy)ethyl]sulphonyl]benzoyl]amino]-2-naphthyl]azo]naphthalene-1,5-disulphonate

2-[[1-Hydroxy-3,6-di(sodiosulfo)-8-[[3-[[2-(sodiosulfooxy)ethyl]sulfonyl]benzoyl]amino]-2-naphthalenyl]azo]-1,5-naphthalenedisulfonic acid disodium salt