Research Article

A New Flavanone as a Potent Antioxidant Isolated from Chromolaena odorata L. Leaves

Table 2

1D- and 2D NMR spectroscopic data of compounds (1-3) in CDCl3.

PositionIsosakuranetin Odoratenin Subscandenin
(J in Hz) (J in Hz)HMBC (J in Hz)HMBC

25.36 (dd; J=13.2, 3.2 Hz, 1H)79.105.32 (dd; J=12.8, 3.2 Hz, 1H)79.06-5.34 (dd; J=13.2, 3.2 Hz, 1H)79.13-
3a2.78 (dd; J=17.8, 3.2 Hz, 1H)43.202.78 (dd; J=17.0, 3.2 Hz, 1H)43.30C-42.77 (dd; J=17.2, 3.2 Hz, 1H)43.29C-4
3b3.09 (dd; J=17.0, 13.2 Hz, 1H)3.07 (dd; J=17.2, 12.8 Hz, 1H)C-2, 43.07 (dd; J=17.2, 12.8 Hz, 1H)C-2, 4
4-196.18-196.07-196.96-
512.04 (s; 1H)164.4312.01 (s; 1H)162.93C-6, 7, 8, 1012.19 (s; 1H)158.78-
65.97 (d; J=2.4 Hz, 1H)96.766.06 (d; J=2.8 Hz, 1H)95.19C-4, 7, 9, 106.10 (s; 1H)94.66C-5, 8, 9, 10
75.76 (br s; 1H)164.59-164.196.46 (br s; 1H)154.43-
7-OMe--3.82 (s; 3H)55.79C-9---
85.99 (d; J=2.4 Hz, 1H)95.546.04 (d; J=2.4 Hz, 1H)94.33C-6, 9, 10-128.38-
8-OMe-----3.94 (s; 3H)61.09C-4, 8
9-163.36-168.05--157.50-
10-103.20-103.20--103.19-
1’-130.36-147.06--130.36-
2’7.37 (d; J=8.8 Hz, 1H)114.337.04 (d; J=2,0 Hz, 1H)112.73C-2, 1’, 4’6.95 (d; J=10 Hz, 1H)127.81C-1’, 3’, 4’, 5’
3’6.95 (d; J=8.4 Hz, 1H)127.855.69 (s; 1H)145.99-7.37 (d; J=9,2 Hz, 1H)114.30C-1’, 2’, 4’, 6’
4’-160.146.91 (d, J=1.6 Hz, 1H)118.26C-1’-160.13-
4’-OMe3.83 (s; 3H)55.48---3.82 (s; 3H)55.46C-4’
5’6.95 (d; J=8.4 Hz, 1H)127.856.88 (d; J=8.4 Hz, 1H)110.72C-2, 2’, 3’, 6’7.37 (d; J=9.2 Hz, 1H)114.30C-1’, 2’, 4’, 6’
6’7.37 (d; J=8.8 Hz, 1H)114.33-131.59-6.95 (d; J=10 Hz, 1H)127.81C-1’, 3’, 4’, 5’
6’-OMe--3.92 (s; 3H)56.14C-1’---