The molecule is an anionic C5 cyanine-type compound having indoleinine and dihydropyrano[3,2-g]quinolinium substituents at either end. It has a role as a fluorochrome.
3-(3-carboxypropyl)-2-[(1E,3E,5E)-5-(9-ethyl-6,8,8-trimethyl-2-phenylpyrano[3,2-g]quinolin-4-ylidene)penta-1,3-dienyl]-3-methyl-1-(3-sulfonatopropyl)indol-1-ium-5-sulfonate