The molecule is an anionic C5 cyanine-type compound having indoleinine and chromenylium substituents at either end. It has a role as a fluorochrome.
(2E)-2-[(2E,4E)-5-(2-tert-butyl-7-diethylazaniumylidenechromen-4-yl)penta-2,4-dienylidene]-3-(3-carboxypropyl)-3-methyl-1-(3-sulfonatopropyl)indole-5-sulfonate