Following the procedure described for the preparation of N-((1S)-1-{[((1S)-3-methoxy-2-oxo-1-{[(3S)-2-oxopyrrolidin-3-yl]methyl}propyl)amino]carbonyl}-3,3-dimethylbutyl)-1H-indole-2-carboxamide but substituting iodoethane and making noncritical variations provided a crude tan foam. This material was purified by Biotage MPLC (25 M column, 3–5% methanol/chloroform) to afford 19 mg (6%) of the title compound as an off-white solid. 1H NMR (DMSO-d6) δ 11.58 (s, 1H), 8.48 (d, J = 8 Hz, 1H), 8.45 (d, J = 8 Hz, 1H), 7.61 (apar d, J = 8 Hz, 2H), 7.41 (d, J = 8 Hz, 1H), 7.23 (s, 1H), 7.17 (t, J = 8 Hz, 1H), 7.02 (t, J = 8 Hz, 1H), 4.56 (m, 1H), 4.40 (m, 1H), 4.28 (d, J = 16 Hz, 1H), 4.13 (d, J = 16 Hz, 1H), 3.41 (m, 2H), 3.06 (m, 2H), 2.26 (m, 1H), 2.09 (m, 1H), 1.91 (m, 1H), 1.82 (m, 1H), 1.63 (m, 3H), 1.08 (t, J = 8 Hz, 3H), 0.94 (s, 9H); MS (ESI+) for C26H36N4O5m/z 485.2 (M + H)+; HRMS (ESI+) calcd for C26H36N4O5 485.2759, found 485.2756.