Synonyms: Chromate(3-), bis(3-(hydroxy-kappaO)-4-(2-(2-(hydroxy-kappaO)-1-naphthalenyl)diazenyl-kappaN1)-7-nitro-1-naphthalenesulfonato(3-))-, hydrogen, compd. with N,N'-bis(2-methylphenyl)guanidine (1:3:3);Chromate(3-), bis(3-hydroxy-4-((2-hydroxy-1-naphthalenyl)azo)-7-nitro-1-naphthalenesulfonato(3-))-, trihydrogen, compd. with N,N'-bis(2-methylphenyl)guanidine (1:3);Trihydrogen bis(3-hydroxy-4-((2-hydroxy-1-naphthyl)azo)-7-nitronaphthalene-1-sulphonato(3-))chromate(3-) , compound with N,N'-bis(o-tolyl)guanidine (1:3);chromium(3+) hydrogen 7-nitro-3-oxido-4-[(E)-(2-oxidonaphthalen-1-yl)diazenyl]naphthalene-1-sulfonate - 1,2-bis(2-methylphenyl)guanidine (1:3:2:3)