1H NMR (600 MHz, CDCl3) δ 8.29 (s, 1H), 8.28 (s, 1H), 8.116 (2s, 2H), 7.79 (s, 1H), 7.65 (dd, J = 8.4 Hz, J = 2.1 Hz, 1H), 7.39 (d, J = 8.4 Hz, 1H), 6.02–5.93 (m, 6H), 5.36 (dd, J = 6.4 Hz, J = 1.8 Hz, 1H), 5.05 (dd, J = 6.4 Hz, J = 3.8 Hz, 1H), 4.51 (dd, J = 6.1 Hz, J = 4.7 Hz, 1H), 4.44 (dt, J = 8.5 Hz, J = 4.3 Hz, 1H), 4.19 (dd, J = 4.7 Hz, J = 3.0 Hz, 1H), 4.05–3.97 (m, 2H), 3.82 (t, J = 5.5 Hz, 2H), 3.79–3.65 (m, 3H), 3.46 (q, J = 5.3 Hz, 2H), 1.56 (s, 3H), 1.35 (s, 3H), 0.92 (br. s, 9H), 0.90 (br. s, 9H), 0.12–0.05 (m, 12H).