1H NMR (500 MHz, DMSO‑d 6) δ 8.42 (d, J = 2.2 Hz, 1H), 8.34 (s, 1H), 8.32 (s, 1H), 8.144 (s, 1H), 8.140 (s, 1H), 7.96 (dd, J = 8.5 Hz, J = 2.2 Hz, 1H), 7.77 (d, J = 8.5 Hz, 1H), 7.41 (br. s, 2H) 7.35 (br. s, 2H), 5.90 (d, J = 5.2 Hz, 1H), 5.83 (d, J = 5.8 Hz, 1H), 5.59 (d, J = 6.0 Hz, 1H), 5.48–5.31 (m, 2H), 5.25 (d, J = 5.3 Hz, 1H), 4.72 (q, J = 5.5 Hz, 1H), 4.36 (t, J = 5.0 Hz, 1H), 4.29 (q, J = 4.6 Hz, 1H), 4.22–4.08 (m, 2H), 3.87 (q, J = 3.6 Hz, 1H), 3.78–3.70 (m, 2H), 3.67 (dd, J = 12.2 Hz, J = 3.4 Hz, 1H), 3.56–3.29 (m, 5H).