The molecule is a cationic fluorescent dye derived from 9-phenylxanthene. It has a role as a fluorochrome. It is an iminium ion and a xanthene dye.
(2,5-dioxopyrrolidin-1-yl) 1-[2-[3-(1,3-dihydroisoindol-2-ium-2-ylidene)-6-(1,3-dihydroisoindol-2-yl)xanthen-9-yl]phenyl]sulfonylpiperidine-4-carboxylate