Table 2.
NMR assignments for the new isolated compounds.
| Position | 8 | 11 | ||
|---|---|---|---|---|
| δH | δC | δH | δC | |
| 1 | - | 184.7 | - | 182.8 |
| 2 | - | 148.3 | - | 147.5 |
| 3 | 7.21 s | 118.9 | 6.60 t, J = 1.22 | 133.6 |
| 4 | - | 184.7 | - | 182.8 |
| 5 | - | 153.1 | - | 153.4 |
| 6 | 7.31 s | 121.1 | 7.32 s | 120.8 |
| 7 | 7.31 s | 121.1 | 7.32 s | 120.8 |
| 8 | - | 153.1 | - | 153.4 |
| 9 | - | 121.2 | - | 120.9 |
| 10 | - | 121.2 | - | 120.9 |
| OCH3 | 3.95 s | 57.3 | 3.96 s | 57.8 |
| 1′ | 3.25 d, J = 5.68 | 32.0 | 5.94 m | 70.0 |
| 2′ | 5.73 dt, J = 15.85; 5.68 | 121.8 | 2.45–2.60 m | 31.1 |
| 3′ | 5.80 d, J = 15.85 | 142.1 | 5.11 m | 117.1 |
| 4′ | - | 69.9 | - | 134.9 |
| 5′ | 1.35 s | 30.4 | 1.57 brs | 14.9 |
| 6′ | 1.27 s | 26.9 | 1.64 brs | 27.1 |
| 1′′ | - | 175.0 | ||
| 2′′ | 2.42 m | 42.4 | ||
| 3′′ | 2.25 m | 44.8 | ||
| 4′′ | 0.92 t, J = 7.32 | 12.7 | ||
| 5′′ | 1.15 d, J = 7.02 | 17.6 | ||
| 1′′′ | - | 170.0 | ||
| 2′′′ | 2.28 m | 44.9 | ||
| 3′′′ | 2.14 m | 27.1 | ||
| 4′′′ | 0.96 d, J = 6.71 | 23.9 | ||
| 5′′′ | 0.97 d, J = 6.71 | 23.9 | ||
Note: Spectra were acquired at 40,014 MHz for 1H and 100 MHz for 13C in CDCl3 using TMS as internal reference. The chemical shifts (δ) are expressed in ppm. All coupling constants (J) are expressed in Hz.