1H NMR (500 MHz, CDCl3)) δ 8.286 (s, 1H), 8.292 (s, 1H), 8.14 (s, 1H), 7.82 (s, 1H), 7.66 (d, J = 8.9 Hz, 1H), 6.92 (d, J = 2.6 Hz, 1H), 6.74 (dd, J = 9.0 Hz, J = 2.6 Hz, 1H), 6.01 (d, J = 3.2 Hz, 1H), 5.97–5.88 (m, 5H), 5.31 (dd, J = 6.5 Hz, J = 2.1 Hz, 1H), 4.99 (dd, J = 6.4 Hz, J = 3.7 Hz, 1H), 4.52 (dd, J = 6.1 Hz, J = 4.6 Hz, 1H), 4.43 (dt, J = 8.4 Hz, J = 4.2 Hz, 1H), 4.22 (dd, J = 4.7 Hz, J = 3.2 Hz, 1H), 4.06 (dt, J = 6.1 Hz, J = 3.1 Hz, 1H), 3.97 (dd, J = 11.5 Hz, J = 3.5 Hz, 1H), 3.86–3.49 (m, 10H), 1.55 (s, 3H), 1.33 (s, 3H), 0.90 (br. s, 18H), 0.11–0.05 (m, 12H).