IUPAC:sodium 2-{3-[1-(5-carboxylatopentyl)-3,3-dimethyl-5-sulfo-2,3-dihydro-1H-indol-2-ylidene]prop-1-en-1-yl}-1,3,3-trimethyl-3H-indol-1-ium-5-sulfonate
IUPAC:sodium 2-{3-[1-(5-carboxylatopentyl)-3,3-dimethyl-5-sulfo-2,3-dihydro-1H-indol-2-ylidene]prop-1-en-1-yl}-1,3,3-trimethyl-3H-indol-1-ium-5-sulfonate