1H NMR (200 MHz, CDCl3) δ: 2.27 (d, J = 3.0 Hz, 1H), 3.34 (d, J = 9.7 Hz, 1H), 3.49 (s, 3H), 3.54 (s, 3H), 3.82–3.90 (m, 2H), 4.30 (bs, 1H), 4.42 (d, J = 3.5 Hz, 1H ), 4.46–4.50 (m, 1H), 5.29 –5.35 (m, 1H), 5.36–5.46 (m, 1H), 6.05 (ddd, J = 17.4, 10.6, 6.6 Hz, 1H).
13C NMR (50 MHz, CDCl3)δ: 56.2 (CH3), 57.7 (CH3), 77.9 (CH), 78.2 (CH), 82.9 (CH), 85.7 (CH), 105.0 (CH), 118.9 (CH2), 132.7 (CH) ppm.