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-diethylazaniumylidenechromen-4-yl)prop-2-enylidene]-3-(3-carboxypropyl)-3-methyl-1-(3-sulfonatopropyl)indole-5-sulfonate