1H NMR (500 MHz, DMSO‑d 6) δ 8.36 (s, 1H), 8.32 (s, 1H), 8.14 (s, 1H), 8.13 (s, 1H), 7.33 (br. s, 2H), 7.25 (br. s, 2H), 5.97 (d, J = 6.3 Hz, 1H), 5.85 (d, J = 5.2 Hz, 1H), 5.49–5.39 (m, 3H), 5.14 (d, J = 5.3 Hz, 1H), 4.62 (q, J = 5.4 Hz, 1H), 4.52 (dd, J = 6.5, 4.7 Hz, 1H), 4.29 (dd, J = 4.8, 2.8 Hz, 1H), 4.06 (q, J = 4.9 Hz, 1H), 4.00–3.92 (m, 2H), 3.68–3.46 (m, 4H), 2.79 (dd, J = 14.0, 4.6 Hz, 1H), 2.70–2.51 (m, 3H), 2.41–2.30 (m, 2H), 1.22 (q, J = 7.4, 2H), 1.07 (tdd, J = 13.4 Hz, J = 10.5 Hz, J = 6.3 Hz, 2H), 0.73 (t, J = 7.3 Hz, 2H).