3-Hydroxy-4-((4-((4-((2-hydroxy-6-sulpho-1-naphthyl)azo)-o-tolyl)methyl)-m-tolyl)azo)naphthalene-2,7-disulphonic acid, compound withN,N'-di(o-tolyl)guanidine, sodium salt 85030-32-6 EINECS 285-157-5