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1H and 13C NMR (CDCl3, 500.13 MHz and 125.8 MHz) and HMBC assignment for similanpyrone B (2b).
| Position | δC, Type | δH, (J in Hz) | COSY | HMBC |
|---|---|---|---|---|
| 1 | 166.1, CO | - | ||
| 3 | 153.3, C | - | ||
| 4 | 104.2, CH | 6.46, s | CH3-3 | C-5, 8a |
| 4a | 136.5, C | - | ||
| 5 | 101.4, CH | 6.40, s | C-4, 6, 7, 8a | |
| 6 | 163.7, C | - | ||
| 7 | 109.6, C | - | ||
| 8 | 160.0, C | - | ||
| 8a | 97.5, C | - | ||
| CH3-3 | 18.8, CH3 | 2.20, s | C-3, 4 | |
| CH3-7 | 8.0, CH3 | 2.00, s | C-6, 7, 8 | |
| OH-6 | - | 3.45, br | ||
| OH-8 | - | 11.27, s | C-7, 8, 8a |
