2-[5-[1,1-Dimethyl-3-(4-sulfobutyl)-1,3-dihydrobenzo[e]indol-2-ylidene]-1,3-pentadienyl]-1,1-dimethyl-3-(4-sulfobutyl)-1H-benzo[e]indolium Hydroxide Inner Salt Sodium Salt
5-[1,1-Dimethyl-3-(4-sulfonatobutyl)benz[e]indolin-2-ylidene]-1-[1,1-dimethyl-3-(4-sulfonatobutyl)benz[e]indolium-2-yl]-1,3-pentadiene Sodium Salt