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Synthesis scheme of PMet-P(cdmPEG2K) polymer. a) cdm, oxalyl chloride, DMF, rt, 1 h; b) monomethoxy PEG2K, DCM, rt, 24 h; c) Boc2O, TEA, MeOH, rt, 24 h; d) AIBN, 4-Cyano-4-[(dodecylsulfanylthiocarbonyl) sulfanyl] pentanoic acid, THF, 90 °C, 24 h; e) MET, DIPEA, DMSO, 110 °C, 48 h; f) TFA, DMSO, rt, 2 h; g) Compound 2, DMSO, 37 °C, 24 h.
