1H NMR (600 MHz, CDCl3) δ 8.30 (2s, 2H), 8.14 (s, 1H), 8.03–7.98 (m, 2H), 7.74 (s, 1H), 7.70–7.66 (m, 2H), 6.11–5.93 (m, 5H), 5.89 (d, J = 1.9 Hz, 1H), 5.35 (dd, J = 6.4 Hz, J = 1.9 Hz, 1H), 5.04 (dd, J = 6.4 Hz, J = 3.8 Hz, 1H), 4.51 (dd, J = 6.1 Hz, J = 4.6 Hz, 1H), 4.43 (dt, J = 8.5 Hz, J = 4.2 Hz, 1H), 4.22 (dd, J = 4.7 Hz, J = 3.2 Hz, 1H), 4.05 (dt, J = 5.9 Hz, J = 3.0 Hz, 1H), 3.99 (dd, J = 11.5 Hz, J = 3.5 Hz, 1H), 3.85–3.41 (m, 7H), 1.57 (s, 3H), 1.35 (s, 3H), 0.92 (s, 9H), 0.91 (s, 9H), 0.14–0.04 (m, 12H).