“…White powder; mp 84 °C with decomposition; [α] D 25 +71 (c 0.2, CHCl 3 ). 1 H NMR (CDCl 3 , 400 MHz): δ 7.03 (1H, dm, J 15,14 = 7.9 Hz, H15), 6.84 (1H, dd, J 14,13 = J 14,15 = 7.9 Hz, H13), 6.76 (1H, dd, J 13,14 = 8.1 Hz, J 13.15 = 1.7 Hz, H13), 5.50−5.45 (1H, m, H5), 4.46 (s, 1H, H1), 3.85 (1H, dm, 2 J = 10.9 Hz, H2′), 3.81 (3H, s, Me19), 3.74 (1H, dd, 2 J = 10.9 Hz, J 2,3 = 2.1 Hz, H2), 2.34 (1H, dm, 2 J = 19.1 Hz, H6′), 2.13−2.08 (1H, m, H3), 1.85 (1H, dm, 2 J = 19.0 Hz, H6), 1.76 (1H, dm, 2 J = 11.7 Hz, H8′), 1.72−1.67 (3H, m, Me16), 1.62 (1H, dd, 2 J = 11.6 Hz, J 8,3 = 3.2 Hz, H8), 1.40 (3H, s, Me18), 1.30 (3H, s, Me17). 13 C{ 1 H} NMR (CDCl 3 , 100 MHz): δ 147.8 (s, C12), 142.0 (s, C11), 133.9 (s, C4), 123.5 (d, C5), 122.5 (s, C10), 119.7 (d, C14), 118.6 (d, C15), 110.5 (d, C13), 81.2 (s, C9), 78.6 (d, C1), 69.4 (t, C2), 55.8 (q, C19), 36.7 (d, C3), 35.0 (s, C7), 31.1 (t, C8), 27.5 (t, C6), 23.0 (q, C18), 22.0 (q, C17), 21.6 (q, C16).…”