PCL(5k)-PEG(2k)-FITC is an amphiphile polymer with polycaprolactone (PCL) hydrophobic block and PEG hydrophilic block. The PEG is functionalized with green fluorphore/fluorescein which can be easily tracked by fluorescence microscopy. The self-assembling polymer can be used in nanomedicines for formulation of vesicular drug delivery system. Reagent grade, for research purpose.