3H-Indolium, 2-[5-[1,3-dihydro-1-[6-[[3-(hydroxymethyl)-3-buten-1-yl]amino]-6-oxohexyl]-3,3-dimethyl-5-sulfo-2H-indol-2-ylidene]-1,3-pentadien-1-yl]-1-ethyl-3,3-dimethyl-5-sulfo-, inner salt
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