PLGA(4k)-PEG(2k)-VS enables reaction with thiol molecule via thiol-ene reaction. The polymer is amphiphilic which can self-assemble in aqueous soluton with poly(lactide-co-glycolide) as core and PEG as shell facing the water. It can be used to encapsulate hydrophobic drugs for controlled release drug delivery. Reagent grade, for research purpose.