disodium;6-[4-[2-[7-[2-(2,5-disulfoanilino)-2-oxoethyl]-2-[3-[7-[2-(2,5-disulfoanilino)-2-oxoethyl]-3,3-dimethyl-5-[2-[4-[methylsulfonyl(3-sulfopropyl)amino]phenyl]ethynyl]pyrrolo[2,3-b]pyridin-2-ylidene]prop-1-enyl]-3,3-dimethylpyrrolo[2,3-b]pyridin-7-ium-5-yl]ethynyl]-N-methylsulfonylanilino]hexanoic acid