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| 1,5,8-Trihydroxy-3-methylxanthone (CDCl3) | ||
|---|---|---|
| Position | δC | δH (J in Hz) |
| 1 | 161.4 | - |
| 1–OH | - | 11.85 (s) (1H) a |
| 2 | 111.9 | 6.62 (m) (1H) |
| 3 | 150.6 | - |
| 3–CH3 | 22.7 | 2.45 (s) (3H) |
| 4 | 108.5 | 6.89 (m) (1H) |
| 4a | 156.9 | - |
| 5 | 137.8 | - |
| 6 | 124.6 | 7.24 (d, 9.0) (1H) |
| 7 | 110.0 | 6.64 (d, 9.0) (1H) |
| 8 | 153.6 | - |
| 8–OH | - | 11.27 (br s) (1H) a |
| 8a | 108.6 | - |
| 9 | 186.5 | - |
| 9a | 106.4 | - |
| 10a | 144.7 | - |
a Signals appearing in DMSO-d6 only.
