Table 1.
NMR spectral data of isolated compounds 2 and 5 (CDCl3, 850 and 212.5 MHz).
| No. | 2 | 5 | |||
|---|---|---|---|---|---|
| δH [Mult. J (Hz)] | δC | δH [Mult. J (Hz)] | δC | ||
| 1 | - | 159.7 | 1 | - | 178.0 |
| 2 | - | 166.4 | 3 | 4.18 d (9.4), 4.28 d (9.4) | 70.4 |
| 3 | - | 146.4 | 3a | - | 82.0 |
| 4 | 7.69 s | 121.5 | 3a′ | - | 35.2 |
| 4a | - | 129.0 | 5 | 5.11 d (1.7) | 92.0 |
| 4b | - | 133.1 | 6 | 1.25 m, 1.28 m | 29.7 |
| 5 | 7.83 dd (1.7,7.6) | 120.3 | 6a | 2.70 m | 38.4 |
| 6 | 7.70 d (7.6) | 137.4 | 7 | 3.02 m | 35.3 |
| 7 | 7.31 dd (1.7,7.6) | 124.9 | 8 | - | 173.0 |
| 8 | - | 162.6 | 9 | - | 82.0 |
| 8a | - | 115.7 | 9a | 4.37 dd (4.2,11.9) | 75.5 |
| 8b | - | 114.1 | 10 | 1.78 m, 1.84 m | 23.9 |
| 9 | - | 192.4 | 11 | 1.62 m, 2.42 m | 26.5 |
| 10 | - | 181.4 | 12 | 1.41 d (6.8) | 13.7 |
| OCH3 | 3.99 s | 52.8 | 13 | 1.20 s | 15.3 |
| CH3 | 2.44 s | 20.1 | 14 | 1.43 s | 23.0 |
| OH-1 | 12.37 | - | 2′ | 7.54 brs | 139.4 |
| OH-8 | 11.90 | - | 3′ | - | 121.0 |
| 4′ | 6.45 brs | 107.0 | |||
| 5′ | 7.40 brs | 144.8 | |||