2,7-Naphthalenedisulfonic acid, 4-hydroxy-5-(((4-methylphenyl)sulfonyl)amino)-3-(phenylazo)-, compd. with N,N'-bis(2-methylphenyl)guanidine (1:2) 4-Hydroxy-3-(phenylazo)-5-(((p-tolyl)sulphonyl)amino)naphthalene-2,7-disulphonic acid, compound with N,N'-di(o-tolyl)guanidine (1:2) 72906-52-6 EINECS 277-005-1