2-[5-[3,3-Dimethyl-5-oxidoperoxysulfanyl-1-(sulfonatomethyl)indol-2-ylidene]penta-1,3-dienyl]-1,1-dimethyl-3-(sulfonatomethyl)benzo[e]indol-3-ium-7-sulfonate;2-[3-[3,3-dimethyl-5-oxidoperoxysulfanyl-1-(sulfonatomethyl)indol-2-ylidene]prop-1-enyl]-1,1-dimethyl-3-(sulfonatomethyl)benzo[e]indol-3-ium-7-sulfonate;1,1-dimethyl-7-oxidoperoxysulfanyl-3-(sulfonatomethyl)-2-[3-[1,1,9-trimethyl-7-sulfonato-3-(sulfonatomethyl)benzo[e]indol-2-ylidene]prop-1-enyl]benzo[e]indol-3-ium-9-sulfonate