2-[[(2E)-2-[(2Z,4E)-5-[6,8-bis[(1-carboxy-2-sulfoethyl)carbamoyl]-1,1-dimethyl-3-(3-sulfopropyl)benzo[e]indol-3-ium-2-yl]-3-[5-[[3-oxo-3-[(5-sulfamoyl-1,3,4-thiadiazol-2-yl)amino]propyl]carbamoyl]pyridin-2-yl]penta-2,4-dienylidene]-6-[(1-carboxy-2-sulfoethyl)carbamoyl]-1,1-dimethyl-3-(3-sulfopropyl)benzo[e]indole-8-carbonyl]amino]-3-sulfopropanoic acid