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)-3-(3-carboxypropyl)-2-[(E)-3-(7-diethylazaniumylidene-3-methyl-4-phenylchromen-2-yl)prop-2-enylidene]-3-methyl-1-(3-sulfonatopropyl)indole-5-sulfonate