Following the procedure described for the preparation of N-((1S)-1-{[((1S)-3-hydroxy-2-oxo-1-{[(3S)-2-oxopyrrolidin-3-yl]methyl}propyl)amino]carbonyl}-3-methylbutyl)-4-methoxy-1H-indole-2-carboxamide but substituting N1-((1S)-3-chloro-2-oxo-1-{[(3S)-2-oxopyrrolidin-3-yl]methyl}propyl)-4-methyl-N2-[(2R)-tetrahydrofuran-2-ylcarbonyl]-l-leucinamide and making noncritical variations provided a crude product. This material was purified by a series of two radial chromatographies (first −2 mm plate, 90:10 dichloromethane/methanol to 90:20, sample loaded in 90:10) (second −1 mm plates, 90:10 dichloromethane/methanol to 95:5, sample loaded in dichloromethane) to provide 0.402 g (46%) of the title compound as a light yellow foam. Rf = 0.44 (90:10 dichloromethane/methanol); 1H NMR (400 MHz, DMSO-d6) δ 8.27 (d, J = 8 Hz, 1H), 7.71 (d, J = 9 Hz, 1H), 7.65 (s, 1H), 5.11 (t, J = 6 Hz, 1H), 4.46–4.38 (m, 1H), 4.37–4.30 (m, 1H), 4.24–4.15 (m, 2H), 4.14–4.08 (m, 1H), 3.96–3.87 (m, 1H), 3.79–3.70 (m, 1H), 3.18–3.06 (m, 2H), 2.25–2.16 (m, 1H), 2.13–2.02 (m, 2H), 1.87–1.75 (m, 4H), 1.66–1.54 (m, 4H), 0.88 (s, 9H); MS (ESI+) for C20H33N3O6m/z 412 (M + H). Anal. calcd for C20H33N3O6·0.5H2O: C, 57.12; H, 8.16; N, 9.99. Found: C, 57.25; H, 7.93; N, 9.68. HRMS (ESI+) calcd for C20H33N3O6+H 412.2442, found 412.2447.