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1H (600 MHz) and 13C (151 MHz) NMR data for compound 16 in Pyridine-d5
| Position | δH, m(J in Hz) | δC | HMBC |
|---|---|---|---|
| 2 | 164.5 | ||
| 3 | 101.6 | ||
| 4 | 142.3 | ||
| 4a | 114.1 | ||
| 5 | 8.13, d (9.1) | 118.8 | C-4, C-8, C-8a |
| 6 | 7.54, d (9.1) | 117.3 | C-7, C-8, C-4a |
| 7 | 140.2 | ||
| 8 | 151.6 | ||
| 8a | 157.4 | ||
| 3b | 7.15, d (2.7) | 105.3 | C-2, C-3, C-4 |
| 2a | 7.80, d (2.7) | 142.9 | C-2, C-3, C-3b |
| 7-OCH3 | 4.23, s | 61.1 | C-7 |
| 8-OCH3 | 4.27, s | 58.9 | C-8 |
| -OH | 12.03, s |
