1H-Imidazolium, 1-[3-[1-[3-[1-[3-[[[4′-[[[4-[[[4-[3,6-bis(dimethylamino)xanthylium-9-yl]-3-carboxy-2,5-dichlorobenzoyl]amino]methyl]benzoyl]amino]methyl]-3′,6′-dihydroxy-3-oxospiro[isobenzofuran-1(3H),9′-[9H]xanthen]-5-yl]carbonyl]amino]propyl]-1H-imidazolium-3-yl]propyl]-1H-imidazolium-3-yl]propyl]...