Table 1.

NMR spectra of the compound 8 in DMSO-d ₆.

No.	13C-NMR	1H-NMR	HMBC
2	78.4	5.37 (dd, J = 12.4, 2.9 Hz, 1H)	H-3b, H-2′ or H-6′
3	42.1	2.69 (dd, J = 17.0, 2.9 Hz, 1H)
		3.18 (dd, J = 17.0, 12.5 Hz, 1H)
4	196.2		H-3a, H3b
5	162.9		H-6
6	95.8	5.88 (d, J = 1.2 Hz, 1H)	5-OH
7	166.7		H-6 or H-8
8	95.0	5.88 (d, J = 1.2 Hz, 1H)
9	163.4		H-8, 5-OH
10	101.7		H-6 or H-8, 5-OH
1′	129.4		H-3b, H-2′ or H-6′
2′	117.9	6.75 (brs, 1H)	H-4′
3′	145.7		H-4′
4′	114.3	6.88 (brs, 1H)	H-2′ or H-6′
5′	145.2		H-4′, H-2′ or H-6′
6′	115.3	6.75 (brs, 1H)
5-OH		12.14 (s, 1H)
7-OH		10.76 (s, 1H)
3′-OH		9.00 (s, 1H)
5′-OH		9.05 (s, 1H)