3-[2-[(1E,3Z,5E)-5-[6,8-bis[(1-carboxy-2-sulfoethyl)carbamoyl]-1,1-dimethyl-3-(3-sulfopropyl)benzo[e]indol-2-ylidene]-3-[5-[[3-oxo-3-[(5-sulfamoyl-1,3,4-thiadiazol-2-yl)amino]propyl]carbamoyl]pyridin-2-yl]penta-1,3-dienyl]-6,8-bis[(1-carboxy-2-sulfoethyl)carbamoyl]-1,1-dimethylbenzo[e]indol-3-ium-3-yl]propane-1-sulfonate