Structural Characterization of Bioactive Compound

Example 12

White solid. 1H NMR (CD3OD): 5.09 (t, J=7.1 Hz, 1H, H-24), 4.52 (d, J=7.7 Hz, 1H, H-1′), 3.78 (dd, J=11.5, 5.5 Hz, 1H, H-5′-2), 3.68 (td, J=10.4, 4.9 Hz, 1H, H-12), 3.45 (ddd, J=10.4, 8.8, 5.5 Hz, 1H, H-4′), 3.29 (t, J=8.8 Hz, 1H, H-3′), 3.14 (dd, J=11.5, 10.4 Hz, 1H, H-5′-1), 3.13 (dd, J=11.0, 4.4 Hz, 1H, H-3), 3.07 (dd, J=8.8, 7.7 Hz, 1H, H-12), 1.67 (s, 3H), 1.61 (s, 3H), 1.32 (s, 3H), 1.00 (s, 3H), 0.96 (s, 3H), 0.91 (s, 3H), 0.90 (s, 3H), 0.70 (s, 3H); ¹³C NMR (CDCl₃): 132.3 (C-25), 128.2 (C-24), 98.9 (C-1′), 84.8 (C-20), 79.6 (C-3), 78.4 (C-3′), 75.3 (C-2′), 71.8 (C-12), 71.1 (C-4′), 66.8 (C-5′), 57.3, 53.1, 52.4, 51.0, 40.9, 40.2, 40.0, 38.1, 36.7, 35.9, 31.5, 30.8, 28.6, 28.0, 27.2, 25.9, 23.9, 22.4, 19.4, 18.3, 17.8, 17.3, 16.7, 16.3, 16.1.