Figure 5.
Proanthocyanidin B-type structure and main fragments.
| Compound No. | R |
| 1, 8, 13, 38, 42 | H |
| 14, 22, 23, 28, 30 | (epi)catechin |
| 26 | (epi)catechin-(epi)catechin |
| 27, 29 | (epi)catechin-(epi)catechin-(epi)catechin |
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