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. 2021 Apr 13;10(4):598. doi: 10.3390/antiox10040598

Table 1.

1H and 13C NMR spectroscopic data of compounds 1 and 2.

Position 1 2
δ H δc δ H δc
1 162.1 150.2
2 6.86 (2H, d, J = 8.8 Hz) 116.3 148.1
3 7.83 (2H, d, J = 8.8 Hz) 132.0 7.45 (1H, d, J = 2.0 Hz) 118.3
4 116.1 132.4
5 7.83 (2H, d, J = 8.8 Hz) 132.0 7.38 (1H, dd, J = 8.4, 2.0 Hz) 122.5
6 6.86 (2H, d, J = 8.8 Hz) 116.3 6.96 (1H, d, J = 8.4 Hz) 116.5
7 175.4 174.4
1′ 133.5 134.0
2′ 7.24 (2H, d, J = 8.4 Hz) 129.2 7.02 (1H, d, J = 2.0 Hz) 111.4
3′ 6.72 (2H, d, J = 8.4 Hz) 115.9 148.9
4′ 157.9 147.2
5′ 6.72 (2H, d, J = 8.4 Hz) 115.9 6.74 (1H, d, J = 8.4 Hz) 115.9
6′ 7.24 (2H, d, J = 8.4 Hz) 129.2 6.84 (1H, dd, J = 8.4, 2.0 Hz) 120.6
7′ 4.85 (1H, d, J = 5.6 Hz) 73.8 4.93 (1H, d, J = 5.2 Hz) 73.8
8′ 4.48 (1H, m) 84.1 4.33 (1H, m) 86.3
9′ 3.81 (1H, dd, J = 12.0, 4.0 Hz)
3.86 (1H, dd, J = 12.0, 5.6 Hz)
62.0 3.55 (1H, dd, J = 12.0, 5.2 Hz)
3.78 (1H, dd, J = 12.0, 4.4 Hz)
61.7
OCH3-3′ 3.81 (3H, s) 56.3

1H- and 13C-NMR data (δ in ppm) were measured in CD3OD at 400 and 100 MHz. “s”, “d”, “m”, and “dd” were for the singlet, doublet, multiplet, and doublet of doublet signals, respectively.