Indocyanine Green Impurity 67

4,4'- (((1E,3E,5Z,6Z,7E,9E) -5,6-bis ((E) -2- (1,1-dimethyl-3- (4-sulfobutyl) -1,3-dihydro-2H-benzo[e]indol-2-ylidene) ethylidene) deca-1,3,7,9-tetraene-1,10-diyl) bis (1,1-dimethyl-1H-benzo[e]indole-3-ium-2,3-diyl) ) bis (butane-1-sulfonate)