1H NMR (DMSO-d6) δ 8.56 (d, J = 8 Hz, 1H), 8.06 (d, J = 8 Hz, 1H), 7.65–7.53 (m, 4H), 5.17 (d, J = 16 Hz, 1H), 5.10 (d, J = 16 Hz, 1H), 4.44 (m, 1H), 4.25 (m, 1H), 3.12 (m, 2H), 2.25 (m, 1H), 2.06 (m, 1H), 1.97 (m, 1H), 1.84 (s, 3H), 1.63 (m, 3H), 1.45 (m, 2H), 0.90 (d, J = 8 Hz, 3H), 0.85 (d, J = 8 Hz, 3H); MS (ESI+) for C23H29Cl2N3O6m/z 514.0 (M + H)+; anal. calcd for C23H29Cl2N3O6·0.25 H2O·0.1 EtOAc: C, 53.26; H, 5.79; N, 7.96.