Table 3.

¹H and ¹³C NMR data of 1 and 2 (500 and 125 MHz, δ in ppm, J in Hz)

	1 (CD3OD)			2 (DMSO-dδ)
No.	δCa	δH	HMBC	δCa	δH	HMBC
1	63.8			62.1
1a	20.3	1.86 (3H, s)	C-1, 1b, 2	19.1	1.81 (3H, s)	1, 1b, 2
1b	66.5	4.79 (1H, d, 11.6)	C-1, 2	64.9	4.66 (1H, d, 11.6)	1, 2
		4.45 (1H, d, 11.6)	C-1, 1′, 2		4.40 (1H, d, 11.6)
2	173.0			171.3
4	95.1			93.8
4a	26.2	1.77 (3H, s)	C-4, 5	25.4	1.71 (3H, s)	4, 5
5	42.1	3.62 (1H, d, 14.8)	C-4, 6, 7, 27	39.8	3.74 (1H, d, 14.8)	4, 6, 7, 27
		3.52 (1H, d, 14.8)			3.66 (1H, d, 14.8)	4, 6
6	136.8			135.4
7	119.3	7.38 (1H, br s)	C-25, 27	118.0	7.51 (1H, br s)	5, 25, 27
8	138.4			136.7
9	133.8	8.07 (1H, d, 8.5)	C-7, 25	132.5	8.19 (1H, AB)	11, 12, 24
10	125.3	8.21 (1H, d, 8.5)	C-8, 12, 24	124.3	8.21 (1H, AB)
11	131.8			130.3
12	179.1			177.6
13	156.4			155.1
15	157.8			154.6
16	121.8	7.67 (1H, d, 9.0)	C-15, 18, 20	120.9	7.81 (1H, d, 9.0)	15, 18, 20
17	125.9	7.36 (1H, dd, 9.0, 3.0)	C-18	125.3	7.58 (1H, dd, 9.0, 3.0)	18
18	150.3			149.5
18-OH		exchanged			exchanged
19	109.7	7.53 (1H, d, 3.0)	C-17, 18	109.5	7.65 (1H, d, 3.0)	18, 21
20	127.8			126.0
21	175.7			173.1
22	120.4			119.3
23	183.2			180.5
24	142.2			140.2
25	120.7			118.6
26	162.9			161.1
26-OH		exchanged			13.41 (1H, s)	25, 26, 27
27	108.6			106.9
28	167.7			166.1
1′	177.5			175.4
2′	38.8	2.56 (1H, m)		36.7	2.51 (under DMSO)	1′, 2a', 3′
2a'	17.7	1.12 (3H, d, 7.0)	C-3′	16.9	1.05 (3H, d, 6.8)	1′, 2′, 3′
3′	44.5	1.53-1.61 (2H, m)		42.7	1.46 (1H, m)	1′, 2′, 2a', 4′, 4a'
		1.21-1.30 (1H, m)			1.18-1.25 (1H, m)	2′, 2a', 4a'
4′	27.1	1.53-1.61 (2H, m)		25.3	1.52 (1H, m)	4a'
4a'	23.0	0.87 (3H, d, 6.3)	C-3′, 4′, 5′	22.3	0.81 (3H, d, 6.3)	3′, 4′, 4a', 5′
5′	22.7	0.91 (3H, d, 6.3)	C-3′, 4′, 4a'	22.2	0.85 (3H, d, 6.3)	3′, 4′, 4a', 5′
1″				96.8	5.49 (1H, dd, 9.8, 2.0)
2″				34.5	2.02-2.07 (1H, m)
					1.81 (1H, m)
3″				65.6	3.96 (1H, m)	4″, 5″
4″				71.3	4.94 (1H, d, 2.9)	3″, 1-Ac
5″				69.1	3.99 (1H, m)	6″
6″				16.5	1.07 (3H, d, 6.4)	4″, 5″
1-Ac				170.3
2-Ac				20.8	2.11 (3H, s)	1-Ac

^aAssignments confirmed by HSQC correlations