| Umbilicaxanthone A (CDCl3) | ||
|---|---|---|
| Position | δC | δH (J in Hz) |
| 1 | 150.9 | - |
| 1–OH | - | 13.25 (s) (1H) |
| 2 | 118.2 | - |
| 3 | 120.1 | 6.51 (s) (1H) |
| 4 | 142.6 | - |
| 4–OCH3 | 56.4 | 3.75 (s) (3H) |
| 4a | 140.9 | - |
| 5 | 146.4 | - |
| 6 | 102.1 | 6.15 (d, 2.1) (1H) |
| 7 | 156.9 | - |
| 8 | 106.3 | a |
| 8a | 128.9 | - |
| 9 | 179.8 | - |
| 9a | 116.1 | - |
| 10a | 136.5 | - |
| 1′ | 22.0 | 3.19 (d, 6.6) (2H) |
| 2′ | 123.5 | 5.92 (td, 6.6, 1.3) (1H) |
| 3′ | 131.3 | - |
| 4′ | 25.9 | 1.64 (s) (3H) |
| 5′ | 17.9 | 1.57 (s) (3H) |
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