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Reagents: (i) APTS (5%) in toluene, 100°C, 4 h; (ii) Fmoc-TEG-COOH, HATU, DIPEA in DMF, rt, 2 h; (iii) piperidine (20%) in DMF, 20 min; (iv) iodoacetic anhydride, DMF, rt, 2 h; and (v) DAP derivative, DMF, rt, 2 h.
