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Reagents and conditions: (a) 1,5-diiodopentane, K2CO3, acetone, 60 °C, 90%; (b) 22, K2CO3, acetone, 65 °C, 86%; (c) TBAF/AcOH, THF, rt, 80%; (d) Pd(PPh3)4, pyrrolidine, DCM, rt, 100%; (e) Mal-dPEG8-acid, EDCI, DCM, rt, 73%.
