1H NMR (600 MHz, DMSO‑d 6) δ 8.35 (s, 1H), 8.23 (s, 1H), 8.11 (s, 1H), 8.07 (s, 1H), 7.89 (d, J = 1.9 Hz, 1H), 7.50 (d, J = 8.3 Hz, 1H), 7.45 (dd, J = 8.3 Hz, J = 2.0 Hz, 1H), 7.32 (br. s, 2H), 7.24 (br. s, 2H), 5.99 (d, J = 5.9 Hz, 1H), 5.83 (d, J = 5.1 Hz, 1H), 5.51–5.32 (m, 2H), 5.24 (br. s, 1H), 5.13 (br. s, 1H), 4.57 (t, J = 5.2 Hz, 1H), 4.45 (dd, J = 6.1 Hz, J = 4.8 Hz, 1H), 4.30 (t, J = 4.1 Hz, 1H), 4.05 (t, J = 5.0 Hz, 1H), 4.02–3.95 (m, 2H), 3.73–3.63 (m, 4H), 3.58–3.51 (m, 2H), 2.83 (dd, J = 14.0 Hz, J = 4.4 Hz, 1H), 2.73 (dd, J = 14.0 Hz, J = 7.2 Hz, 1H), 2.69–2.63 (m, 2H).