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1-(2,5-Dioxo-pyrrolidin-1-yl-oxycarbonyl)-pentyl-2-[5-[1-(2,5-dioxo-pyrrolidin-1-yl-oxycarbonyl)-pentyl-1,3-dihydro-3,3-dimethyl-5-sulfo-2H-indol-2-ylidene]-3-methyl-penta-1,3-dienyl]-3,3-dimethyl-5-sulfo-3H-indolium hydroxide, inner salt, sodium salt