Indocyanine Green Impurity 68

4- (2- ((2Z,4Z,6E,8E) -8- (1,1-dimethyl-3- (4-sulfobutyl) -1,3-dihydro-2H-benzo[e]indol-2-ylidene) -3- ((1E,3E) -4- (1,1-dimethyl-3- (4-sulfobutyl) -1H-benzo[e]indol-3-ium-2-yl) buta-1,3-dien-1-yl) -4- ((E) -2- (1,1-dimethyl-3- (4-sulfonatobutyl) -1H-benzo[e]indol-3-ium-2-yl) vinyl) octa-2,4,6-trien-1-yl) -1,1-dimethyl-1,2-dihydro-3H-benzo[e]indol-3-yl) butane-1-sulfonate