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Table 1 1H NMR (500 MHz, CDCl3), δH in ppm

From: Isolation and characterization of three new anti-proliferative Sesquiterpenes from Polygonum barbatum and their mechanism via apoptotic pathway

  Compound 1 Compound 2 Compound 3
Carbon No 1H–NMR (δH ppm) 1H–NMR (δH ppm) 1H–NMR (δH ppm)
1
2
3 6.80, s 6.83, s 6.75, s
4
5
6 7.22 (d, J = 9.0 Hz) 7.20 (d, J = 8.3 Hz) 7.22 (d, J = 9.0 Hz)
7 7.46 (d, J = 9.0 Hz) 7.28 (d, J = 8.3 Hz) 7.48 (d, J = 9.0 Hz)
8
9
10 6.51, (d, J = 11.1 Hz) 6.48, (d, J = 11.0 Hz) 6.50, (d, J = 10.8 Hz) m
11 3.20, m 3.20, m 3.18, m
12 1.26, (d, J = 7.4 Hz) 1.28, (d, J = 7.1 Hz) 1.29, (d, J = 7.8 Hz)
13 1.26, (d, J = 7.4 Hz) 1.28, (d, J = 7.1 Hz) 1.29, (d, J = 7.8 Hz)
14
15 4.99, s
16 2.40, s 2.43, s
9-OCH3 3.90, s 3.88, s 3.80, s
14-OCH3 3.87, s