Synonyms: Chromate(1-), bis(4-(hydroxy-kappaO)-3-(2-(2-methyl-4H-pyrazolo(1,5-a)benzimidazol-3-yl-kappaN4)diazenyl-kappaN1)benzenesulfonamidato(2-))-, sodium (1:1);2-Methyl-3-((5-(aminosulfonyl)-2-hydroxyphenyl)azo)pyrazolo(2,3-a)benzimidazole, chromium complex (2:1), sodium salt;Chromate(1-), bis(4-(hydroxy-kappaO)-3-((2-methyl-4H-pyrazolo(1,5-a)benzimidazol-3-yl-kappaN4)azo-kappaN1)benzenesulfonamidato(2-))-, sodium;Sodium bis(4-hydroxy-3-((2-methyl-4H-pyrazolo(1,5-a)benzimidazol-3-yl)azo)benzene-1-sulphonamidato(2-))chromate(1-)