Table 2. 1H and 13C NMR sectral data of compounds 1 and 21)

Position Oolonghomobisflavan A (1) Oolonghomobisflavan B (2)
δH δC δH-Upper δC-Upper δH-Lower δC-Lower
2 5.20 (br s) 79.5 4.99 (br s) 77.8 5.29 (br s) 79.6
3 5.52 (m) 69.3 5.48 (m) 68.9 5.57 (m) 69.3
4 3.07 (m), 2.98 (m) 26.9 3.05 (m), 2.88 (m) 26.5 3.08 (m), 2.97 (m) 26.9
5 - 152.6 - 154.1 - 152.5
6 6.10 (s) 97.4 - 105.8 6.15 (s) 97.1
7 - 155.6 - 154.3 - 154.3
8 - 105.5 6.12 (s) 96.2 - 107.2
9 - 155.8 - 155.5 - 154.9
10 - 99.3 - 99.7 - 100.2
1' - 129.7 - 129.3 - 130.5
2' 6.77 (s) 106.8 6.60 (s) 106.6 6.77 (s) 106.5
3' - 145.9 - 146.2 - 146.0
4' - 133.5 - 132.8 - 133.4
5' - 145.9 - 146.2 - 146.0
6' 6.77 (s) 106.8 6.60 (s) 106.6 6.77 (s) 106.5
1'' - 121.5 - 121.4 - 121.5
2'' 7.11 (s) 110.3 6.99 (s) 109.7 7.08 (s) 109.9
3'' - 146.4 - 145.6 - 145.7
4'' - 139.0 - 138.6 - 138.5
5'' - 146.4 - 145.6 - 145.7
6'' 7.11 (s) 110.3 6.99 (s) 109.7 7.08 (s) 109.9
7'' 166.5 - 166.0 - 166.1
-CH2- 3.98 (s) 16.3 3.87 (s) 17.0
1H NMR spectra were measured at 600 MHz, and 13C NMR spectra were measured at 150 MHz, Data obtained in acetone-d6+D2O. Assignments based on HSQC and HMBC spectra data.