Synonyms: Spiro(isobenzofuran-1(3H),9'(8'aH)-xanthylium), 3',6'-bis(diethylamino)-3-oxo-, chloride, compd. with (4-(2-(4,5-dihydro-3-methyl-5-(oxo-kappaO)-1-phenyl-1H-pyrazol-4-yl)diazenyl-kappaN1)-3-(hydroxy-kappaO)-1-naphthalenesulfonato(3-))chromium (1:1:1);Spiro(isobenzofuran-1(3H),9'(8'aH)-xanthylium), 3',6'-bis(diethylamino)-3-oxo-, chloride, compd. with (4-((4,5-dihydro-3-methyl-5-(oxo-kappaO)-1-phenyl-1H-pyrazol-4-yl)azo-kappaN1)-3-(hydroxy-kappaO)-1-naphthalenesulfonato(3-))chromium (1:1);Spiro(isobenzofuran-1(3H),9'(8'aH)-xanthylium), 3',6'-bis(diethylamino)-3-oxo-, chloride, compd. with (4-((4,5-dihydro-3-methyl-5-oxo-1-phenyl-1H-pyrazol-4-yl)azo)-3-hydroxy-1-naphthalenesulfonato(3-))chromium (1:1)