The molecule is an anionic C3 cyanine-type compound having indoleinine and dihydropyrano[3,2-g]quinoline groups at either end. It has a role as a fluorochrome.
2-[(E,3E)-3-(2-tert-butyl-9-ethyl-6,8,8-trimethylpyrano[3,2-g]quinolin-4-ylidene)prop-1-enyl]-3-(3-carboxypropyl)-3-methyl-1-(3-sulfonatopropyl)indol-1-ium-5-sulfonate