IUPAC:2-[(1E)-2-{6-[(2,4-dinitrobenzenesulfonyl)oxy]-2,3-dihydro-1H-xanthen-4-yl}ethenyl]-1-ethyl-3,3-dimethyl-3H-indol-1-ium 2,4-dinitrobenzene-1-sulfonate
IUPAC:2-[(1E)-2-{6-[(2,4-dinitrobenzenesulfonyl)oxy]-2,3-dihydro-1H-xanthen-4-yl}ethenyl]-1-ethyl-3,3-dimethyl-3H-indol-1-ium 2,4-dinitrobenzene-1-sulfonate