7,7'-[(4,6-dihydroxy-m-phenylene)diazo]bis(naphthalene-1,3-disulphonic) acid, compound with N,N'-di(o-tolyl)guanidine (1:4); 1,3-Naphthalenedisulfonic acid, 7,7'-[(4,6-dihydroxy-1,3-phenylene)bis(azo)]bis-, compd. with N,N'-bis(2-methylphenyl)guanidine (1:4); C.I. Solvent Brown 20; 7,7'-[(4,6-Dihydroxy-1,3-phenylene)bis(2,1-diazenediyl)]bis-1,3-naphthalenedisulfonic acid N,N'-Bis(2-methylphenyl)guanidine; Transparent Brown K
