HO-Thr(Bn)-OH

(S)-1-{(S)-2-[(S)-2-tert-Butoxycarbonylamino-3-(4-hydroxy-phenyl)-propionyloxy]-4-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid (1S,2R)-2-benzyloxy-1-benzyloxycarbonyl-propyl ester