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A novel tri-block copolymer,poly(oxopentanoate ethyl methacrylate)-block-(pyridyl disulfide ethyl acrylate)-block- poly(ethylene glycol acrylate),poly[AEMA-co-PDSEA-co-(PEG-A)],functionalized with keto groups and pyridyl disulfide (PDS) side chains,was synthesized as a drug delivery vehicle through reversible addition-fragmentation chain transfer (RAFT) polymerization method.