1H NMR (400 MHz, DMSO-d6) δ 11.59 (d, J = 1.8 Hz, 1H), 8.54 (d, J = 7.8 Hz, 1H), 8.45 (d, J = 8.1 Hz, 1H), 7.64 (s, 1H), 7.32 (d, J = 1.8 Hz, 1H), 7.08 (t, J = 8.0 Hz, 1H), 7.00 (d, J = 8.3 Hz, 1H), 6.49 (d, J = 7.6 Hz, 1H), 4.52–4.62 (m, 1H), 4.40–4.51 (m, 2H), 3.87 (s, 3H), 3.01–3.16 (m, 2H), 2.19–2.31 (m, 1H), 2.03–2.12 (m, 1H), 1.91–2.01 (m, 1H), 1.81 (dd, J = 14.1, 9.9 Hz, 1H), 1.54–1.72 (m, 3H), 0.93 (s, 9H); MS (ESI+) for C25H33ClN4O5m/z 505.1 (M + H)+; HRMS (ESI+) calcd for (M + H)+ 505.2212, found 505.2204.