3,3'-((4,6-Dihydroxy-m-phenylene)diazo)dibenzenesulphonic acid, compound with N,N'-di(o-tolyl)guanidine (1:2) 72208-27-6 Benzenesulfonic acid, 3,3'-((4,6-dihydroxy-1,3-phenylene)bis(azo))bis-, compd. with N,N'-bis(2-methylphenyl)guanidine (1:2) EINECS 276-476-0