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1 H NMR (600 MHz) and 13 C NMR (150 MHz) data of compound 1 in DMSO- d 6 (δ, ppm)
| Position | δ H (J in Hz) | δ c | Position | δ H (J in Hz) | δ c |
|---|---|---|---|---|---|
| 1 | 12.87 (s, -OH) | 161.6 | 8a | 114.5 | |
| 2 | 7.17 (brs) | 125.1 | 9a | 114.4 | |
| 3 | 147.1 | 10a | 136.4 | ||
| 4 | 7.46 (d, 1.6 Hz) | 119.3 | 1′ | 100.9 | |
| 5 | 7.38 (d, 2.6 Hz) | 106.7 | 2′ | 73.3 | |
| 6 | 164.7 | 3′ | 77.2 | ||
| 7 | 7.19 (d, 2.6 Hz) | 107.5 | 4′ | 69.8 | |
| 8 | 3.74 (s) | 161.1 | 5′ | 76.8 | |
| 9 | 186.4 | 6′ | 60.8 | ||
| 10 | 181.7 | 3-CH3 | 2.39 (s) | 21.3 | |
| 4a | 132.1 | 6-OCH3 | 3.97 (s) | 56.1 |
