1H NMR (DMSO-d6) δ 8.47 (d, J = 8 Hz, 1H), 7.64 (s, 1H), 7.04 (d, J = 8 Hz, 1H), 4.60 (d, J = 16 Hz, 1H), 4.53 (d, J = 16 Hz, 1H), 4.40 (m, 1H), 3.90 (m, 1H), 3.16 (m, 1H), 3.08 (m, 1H), 2.24 (m, 1H), 2.10 (m, 1H), 1.98 (m, 1H), 1.63 (m, 2H), 1.45–1.37 (m, 11 H), 0.89 (d, J = 4 Hz, 3H), 0.85 (d, J = 4 Hz, 3H); MS (ESI+) for C19H32ClN3O5m/z 418.1 (M + H)+.