Table 1. ¹H and ¹³C NMR Data for Aglycones of Compounds 1, 2, and 5^a.

	1		2			5
position	δH	δC	δH	δC	position	δH	δC
1a	1.77b	39.9	1.71b	39.0	2		174.0
1b	1.07, m		1.08b		3	5.91, s	126.6
2a	1.92b	27.0	2.05, m	26.5	4		140.0
2b	1.76b		1.74b		5	7.91, d (16.0)	133.8
3	3.18, dd (11.5, 4.3)	89.6	3.19, dd (12.0, 4.0)	89.5	6	6.25, d (16.0)	126.7
4		39.1		39.0	7		80.5
5	0.83, br d (11.7)	57.3	0.84, br d (11.5)	57.2	8		51.0
6a	1.64b	19.0	1.59b	19.0	9a	2.09, dd (14.0, 7.5)	39.1
6b					9b	1.93, dd (14.0, 11.0)
7a	1.66b	34.3	1.68b	34.2	10	4.01, m	72.8
7b	1.41, m		1.41, m		11a	2.45, dd (14.4, 6.5)	39.0
8		43.0		40.0	11b	1.99, dd (14.4, 10.0)
9	1.61b	52.2	1.71b	48.5	12		87.5
10		36.9		36.0	13	2.04, s	20.1
11a	1.61b	23.5	2.00b	24.1	14		178.0
11b			1.98b		15	1.12, s	14.0
12a	2.67, br dd (16.0, 12.0)	134.0	5.26, t (3.0)	129.4	16	1.40, s	18.2
12b	1.99, m				Glc-1	4.37, d (7.8)	103.0
13		153.3		133.0	2	3.16, br t (9.0)	74.6
14		45.0		41.8	3	3.26, t (9.5)	77.4
15a	1.92b	27.0	1.99b	28.0	4	3.30, t (9.5)	71.3
15b	1.76b		1.82, m		5	3.38, m	77.7
16a	2.15, ddd (14.3, 6.5, 3.8)	34.3	1.89b	27.0	6a	3.86, dd (12.0, 3.0)	62.2
16b	1.93b		1.62b		6b	3.68, dd (12.0, 5.0)
17		53.1		50.0
18		134.0	3.79, s	56.8
19		211.0		216.5
20		45.5		44.0
21a	1.85, ddd (17.0, 14.3, 3.8)	36.6	1.93b	35.2
21b	1.65b		1.77b
22a	2.30, ddd (14.3, 6.6, 3.3)	32.0	2.26, ddd (15.0, 11.0, 4.0)	31.0
22b	1.63b		1.80b
23	1.06, s	28.0	1.07, s	28.1
24	0.87, s	17.0	0.89, s	17.0
25	0.99, s	17.0	1.00, s	16.0
26	0.94, s	14.0	0.85, s	17.5
27	1.27, s	21.0	0.97, s	23.0
28		174.2		175.0
29	1.09, s	26.5	1.22, s	27.0
30	1.10, s	25.5	1.11, s	25.6

^aSpectra were recorded in methanol-d₄ at 600 MHz (¹H) and 150 MHz (¹³C). J values are in parentheses and reported in Hz; chemical shifts are given in ppm; assignments were confirmed by 1D-TOCSY, COSY, HSQC, and HMBC experiments.

^bOverlapped signal.