PCL(4k)-PEG(2k)-FITC is a biocompatible block copolymer with green FITC dye attached to the hydrophilic PEG. The hydrophobic block of polycaprolactone (PCL) can be used to encapsulate lipophilic drugs. The polymer is biodegradable via hydrolysis of the ester bonds. Reagent grade, for research purpose.