Table 1.

¹H (700 MHz), ¹³C (175 MHz), HMBC, COSY, and ROESY NMR data for compound 10 (δ in ppm, J in Hz, CDCL₃).

Position	13C	1H	HMBC	COSY	ROESY
1	122.7	7.85, d, J = 8.5, 1H	C-3, 4, 4a	H-2	H-2
2	113.6	6.95, d, J = 8.5, 1H	C-3, 4, 11b	H-1	H-1
3	159.2
4	104.0	7.13, s, 1H	C-2, 3, 4a, 11b
4a	154.8
6	159.0
6a	103.8
6b	116.0
7	105.4	7.44, s, 1H	C-6a, 6b, 8, 9, 10, 10a		OH-8
8	143.1
9	138.7
10	106.4
10a	145.2
11a	160.1
11b	106.3
1′	115.9	6.89, d, J = 9.9, 1H	C-8, 9, 10, 10a, 3′, 9′	H-2′	H-2′
2′	130.6	5.78, d, J = 9.9, 1H	C-9, 10, 3′, 4′, 9′	H-1′	H-1′, 4′, 5′, 9′
3′	80.6
4′	40.9	1.78, m, 1H	C-2′, 3′, 5′, 6′, 9′	H-5′	H-2′, 5′, 9′
		1.84, m, 1H	C-2′, 3′, 5′, 6′, 9′	H-5′	H-2′, 5′, 9′
5′	22.8	2.13, m, 1H	C-4′, 6′, 7′	H-4′, 6′	H-2′, 4′, 9′
		2.15, m, 1H	C-4′, 6′, 7′	H-4′, 6′	H-2′, 4′, 9′
6′	123.6	5.10, t, J = 6.9, 1H	C-4′, 6′, 8′, 10′	H-5′, 8′, 10′	H-5′, 8′
7′	132.2
8′	25.6	1.67, s, 3H	C-4′ (weak), 6′, 7′, 10′	H-6′	H-6′
9′	26.3	1.50, s, 3H	C-2′, 3′, 4′, 5′ (weak)		H-2′, 4′, 5′
10′	17.6	1.57, s, 3H	C-4′ (weak), 6′, 7′, 8′	H-6′
OH-3		6.54, bs, 1H
OH-8		5.50, bs, 1H	C-7		H-7