1,3-Naphthalenedisulfonic acid, 7-hydroxy-8-((4-(phenylazo)phenyl)azo)-, compd. with N,N'-bis(2-methylphenyl)guanidine (1:2) 7-Hydroxy-8-((4-(phenylazo)phenyl)azo)naphthalene-1,3-disulphonic acid, compound with N,N'-di(o-tolyl)guanidine (1:2) 7-Hydroxy-8-((p-(phenylazo)phenyl)azo)-1,3-naphthalenedisulfonic acid, compd. with 1,3-di-o-tolylguanidine (1:2) 72208-29-8 72906-50-4 EINECS 276-478-1