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Reagents and conditions: (a) DIPEA, THF, methylamino-PEGn-t-butyl ester, 0 to 15 °C, 10 h; (b) N-(4-aminophenyl)-2-phenyl-acetamide, AcOH, IPA, 80 °C, 12 h; (c) HCl in ethyl acetate (4 M), 25 °C, 12 h; (d) (S,R,S)-AHPC, HATU, DIPEA, DMF, 25 °C, 12 h; and (e) (S,S,S)-AHPC hydrochloride, HATU, DIPEA, DMF, 25 °C, 12 h.
