1H NMR (400 MHz, DMSO-d6) δ 11.58 (s, 1H), 8.64 (d, J = 7.8 Hz, 1H), 8.50 (d, J = 7.8 Hz, 1H), 7.55–7.69 (m, 2H), 7.42 (d, J = 8.3 Hz, 1H), 7.26 (d, J = 1.5 Hz, 1H), 7.16 (m, 1H), 7.02 (t, J = 7.5 Hz, 1H), 4.53–4.66 (m, 2H), 4.39–4.52 (m, 2H), 2.94–3.18 (m, 2H), 2.22–2.35 (m, 1H), 2.03–2.16 (m, 1H), 1.89–2.02 (m, 1H), 1.45–1.82 (m, 5H), 0.93 (d, J = 6.3 Hz, 3H), 0.88 (d, J = 6.3 Hz, 3H); MS (APCI−) for C23H29N4O4Cl m/z 459.1 (M – H)−.