2-[7-[1,3-dihydro-1,1-dimethyl-3-(4-sulphonatobutyl)-2H-benz[e]indol-2-ylidene]hepta-1,3,5-trienyl]-1,1-dimethyl-3-(4-sulphonatobutyl)-1H-benz[e]indolium disodium iodide
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