2-(2-(2-Chloro-3-(2-(1,3-dihydro-3,3-dimethyl-1-(4-sulfobutyl)-2H-indol-2-ylidene)-ethylidene)-1-cyclohexen-1-yl)-ethenyl)-3,3-dimethyl-1-(4-sulfobutyl)-3H-indolium hydroxide, inner salt sodium salt
2-(2-(2-chloro-3-(2-(1,3-dihydro-3,3-dimethyl-1-(4-sulfobutyl)-2h-indol-2-ylidene)-ethylidene)-1-cyclohexen-1-yl)-ethenyl)-3,3-dimethyl-1-(4-sulfobutyl)-3h-indolium hydroxide, inner salt sodium salt