The molecule is an anionic C3 cyanine-type compound having indoleinine and chromenylium substituents at either end. It has a role as a fluorochrome.
(2E)-2-[(E)-3-[2-tert-butyl-7-[ethyl(3-sulfonatopropyl)azaniumylidene]chromen-4-yl]prop-2-enylidene]-1-(5-carboxypentyl)-3,3-dimethylindole-5-sulfonate