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Under nitrogen atmosphere, to a stirred mixture of (2S*,3R*)-3-hydroxy-2-(5-phenylpentoxy-carbonylamino)-pentanoic acid (0.07 g, 0.22 mmol) in dry CH2Cl2 (10 mL), at 0° C., Et3N (0.091 mL, 0.65 mmol) and subsequently TBTU (0.083 g, 0.26 mmol) were added. The mixture was left stirring at 0° C. for 1 h and at rt for 15 h. The organics were then removed under reduced pressure, and the resulting crude product purified by column chromatography, using a Teledyne ISCO apparatus, eluting with Cy:AcOEt (from 90:10 to 70:30) to afford the pure title compound (0.043 g, 65%), as a white solid. MS (ESI) m/z: 323 [M−NH4]+; (ESI) m/z: 304 [M−H]−. 1H NMR (DMSO-d6) δ 0.89 (t, J=7.43 Hz, 3H), 1.27-1.41 (m, 2H), 1.45-1.64 (m, 4H), 1.64-1.95 (m, 2H), 2.58 (t, J=7.66 Hz, 2H), 4.01 (t, J=6.49 Hz, 2H), 4.60 (dt, J=6.08, 8.01 Hz, 1H), 5.45 (dd, J=6.02, 9.42 Hz, 1H), 7.05-7.38 (m, 5H), 8.23 (d, J=9.41 Hz, 1H).

1. waitThe mixture was left
2. customThe organics were then removed under reduced pressure
3. customthe resulting crude product purified by column chromatography
4. washeluting with Cy