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1H NMR chemical shift of biphenyclooctene lignans.
| Positions | Chemical shift | |
|---|---|---|
| H4, H11 | 5.9–7.0 | |
| H7, H8 | 1.7–2.8 | |
| H6, H9 | Without substituents | 2.0–2.7 |
| Oxygen-containing substituents | 4.0–6.0 | |
| OCH3 | 3.2–3.9 | |
| OCH2O | 5.6–6.0 | |
| Cyclooctent moiety methyl proton | C7 is substituted for OH | H17 (1.1–1.4) |
| H18 (1.3–1.4) | ||
| H17, H18 | C7 only has methyl substitution | H17,18 (0.6–1.1) |
