河北医科大学药学院2018 H9斗 [gloroomd 4.50 茶大人的 H-6 天然药物化学教研室史清文教授 3河北医科大学药学院2018 天然药物化学教研室史清文教授 3 7 6 5 4 3 2 1 Chemical Shift (ppm) Chloroform-d 5.00 4.75 4.50 Chemical Shift (ppm) 10 5 1 4 2 3 8 7 9 6 13 14 12 11 17 16 15 H3C 28 CH3 29 CH3 19 CH3 18 CH3 30 20 22 H2C 21 23 24 25 CH3 26 H3C 27 O Ac 185 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 Chemical Shift (ppm) 5.625 5.600 Chemical Shift... 3.475 3.450 3.425 Chemical Shift (ppm) 2.00 1.75 1.50 1.25 1.00 Chemical Shift (ppm) 14 13 18 17 16 15 9 11 12 8 H CH3 CH3 CH3 H 5 6 3 7 2 1 4 CH3 H3C HO H H 10 19 20 21 22 CH3 CH3 H3C 186 H H-3 -6