PCL(1k)-PEG(3k)-FITC is a fluorescein attached block copolymer. It can be used to prepare nanoparticles as drug carrier in targeted drug delivery. The polymer is modified with fluorescein (green) dye which can be used for staining cells, tissues, biomarkers, or nanoparticles and can be traced easily with fluorescence microscopy. Reagent grade, for research purpose.