Table 2.

¹³C NMR Chemical Shifts of Compounds 1–5^a

Position	1	2	3	4	5
1	37.6	33.8	33.7	38.6	38.4
2	22.9	23.0	23.0	26.0	26.0
3	73.6	76.1	76.4	72.8	72.7
4	41.3	41.2	41.1	42.5	42.5
5	46.2	46.0	45.8	48.5	48.3
6	17.1	18.2	18.3	18.2	18.2
7	33.2	33.7	33.7	34.0	33.9
8	40.4	40.9	40.9	40.9	40.9
9	49.7	50.3	50.3	50.6	50.5
10	36.2	37.1	37.0	37.1	37.0
11	20.4	20.7	20.7	20.9	20.8
12	24.8	25.1	25.2	25.2	25.2
13	36.7	37.2	37.3	37.3	37.3
14	42.2	42.8	42.8	42.7	42.7
15	26.7	27.0	27.0	27.0	27.0
16	29.0	29.2	29.2	29.2	29.2
17	47.4	47.7	47.8	47.8	47.8
18	48.2	48.8	48.8	48.8	48.8
19	47.3	47.8	47.8	47.9	47.8
20	150.3	150.4	150.5	150.4	150.4
21	29.3	29.7	29.8	29.7	29.8
22	33.8	34.0	34.0	34.0	34.0
23	62.8	68.9	69.0	67.0	67.0
24	13.2	16.8	16.9	11.9	11.9
25	16.2	16.4	16.4	16.7	16.6
26	15.7	16.0	16.0	16.0	16.0
27	14.5	15.0	15.0	14.8	14.7
28	57.9	60.6	60.6	60.6	60.6
29	109.6	109.7	109.7	109.8	109.7
30	18.8	19.1	19.1	19.1	19.1
Coumaric acid
1'	166.1	167.8	167.0	168.0	167.2
2'	114.9	115.0	116.5	114.7	116.5
3'	144.1	145.7	144.8	145.4	144.3
4'	125.1	126.7	126.8	126.6	127.2
5', 9'	130.7	130.2	132.6	130.1	132.4
6', 8'	115.7	115.9	115.2	116.0	115.1
7'	159.6	158.3	157.6	158.6	157.3

^aMeasured at 100 MHz; NMR data of compound 1 was obtained in DMSO-d₆; NMR data of compounds 2–5 were obtained in CDCl₃ with TMS as internal standard. Assignments are based on HSQC, and HMBC NMR spectra.