| Chemical shift δ areas (ppm) | OH type groups |
| 150.8–145.0 | Aliphatic |
| 144.3–140.2 | Condensed phenolic |
| 140.2–138.4 | Guaiacyl phenolic |
| 138.4–136.9 | p-Hydroxyl phenolic |
| 135.6–133.7 | Carboxylic acid |
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