1H NMR (500 MHz, CDCl3) δ 8.33 (s, 1H), 8.30 (s, 1H), 8.15 (s, 1H), 7.85 (d, J = 8.2 Hz, 1H), 7.77 (d, J = 1.7 Hz, 1H), 7.76 (s, 1H), 7.54 (dd, J = 8.4 Hz, J = 1.8 Hz, 1H), 5.97 (d, J = 2.8 Hz, 1H), 5.93 (d, J = 1.9 Hz, 1H), 5.74 (br. s, 4H), 5.33 (dd, J = 6.4 Hz, J = 2.0 Hz, 1H), 5.01 (dd, J = 6.4 Hz, J = 3.8 Hz, 1H), 4.50 (dd, J = 6.4 Hz, J = 4.6 Hz, 1H), 4.43 (dt, J = 8.3 Hz, J = 4.0 Hz, 1H), 4.18 (dd, J = 4.7 Hz, J = 2.8 Hz, 1H), 4.01–3.96 (m, 2H), 3.94–3.78 (m, 4H), 3.77–3.66 (m, 2H), 3.56 (dt, J = 15.5 Hz, J = 5.1 Hz, 1H), 1.55 (s, 3H), 1.34 (s, 3H), 0.91 (s, 9H), 0.89 (s, 9H), 0.13–0.02 (m, 12H).