¹H NMR and ¹³C NMR spectral data of compounds 9–11 in CDCl₃ (δ in ppm, J in Hz).

Position	9a		10b		11a
	δ H	δ C	δ H	δ C	δ H	δ C
1		217.7		217.5/217.3		213.4
2	3.26, m	48.4	3.19, m	48.1	3.19, dd (7.9, 1.9)	57.0
3	4.89, m	79.3	4.97, d (9.8)	78.0/77.9	5.17, d (7.9)	77.1
4		38.8		38.4/38.2		38.4
5	3.37, dd (11.0, 1.5)	40.7	3.11, d (10.7)	41.4/41.2	2.83, t (6.0)	48.4
6	2.42, d (16.5, 11.0)	33.4	2.45, m	33.9	2.29, d (6.0)	32.4
	2.37, d (16.5)		2.36, m
7		174.7		176.3/175.7		174.1
8		135.7		129.2/128.9		130.7
9	2.11, d (6.6)	51.9	2.05c	51.3		142.1
10		53.6		53.1/52.8		50.9
11	1.75, m	18.7	1.79, m	18.7/18.6	2.03, m	21.6
	1.89, m		1.94, m		2.38, m
12	1.00	28.6	1.99, m	28.6	1.58c	29.1
	1.78, m		1.27, m		1.51c
13	1.02, m	38.8		39.1		35.8
14		135.0		130.8/130.5	2.45c	38.2
15	4.97, s	65.4	3.77, m	32.9	2.80, dd (14.0, 3.0)	31.4
			3.46, d (21.0)		2.41, d (14.0)
16		174.5		168.7/168.1		172.7
17	5.54, s	81.9	5.62, br s/5.35, br s	79.7	4.91, s	81.3
18	1.02, 3H, s	16.9	1.08, 3H, s	17.4	0.74, 3H, s	20.4
19	1.18, 3H, s	16.7	1.17, 3H, s	16.9	1.08, 3H, s	17.2
20		120.6		162.8		120.8
21	7.62, s	142.0	6.10, s	98.9/98.0	7.43, s	140.5
22	6.51, s	110.0	6.30, s	122.8/122.1	6.40, s	109.8
23	7.42, s	143.0		169.6/159.4	7.43, s	143.4
28	0.76, 3H, s	20.4	0.68, 3H, s	23.5	1.14, 3H, s	26.5
29	0.83, 3H, s	23.9	0.81, 3H, s	20.6	0.89, 3H, s	25.9c
30	2.99,dd, (15.9, 1.9)	34.6	2.72, d (15.0)	33.1	4.54, br s	71.4
	2.30, dd, (15.9, 6.6)		2.12, d (6.0)
7-OCH3	3.73, 3H, s	52.6	3.71, 3H, s	52.8/52.2	3.69, 3H, s	52.2
15-OH	3.18, br s
1′		167.2		176.3		167.0
2′		129.4	2.40, m	41.3		128.5
3′	6.90, m	138.6	1.73, dt (20.0, 7.0)	27.3	6.92, m	139.1
			1.51, dt (14.0, 7.0)
4′	1.87, 3H, m	12.5	1.21, 3H, m	16.2	1.89, 3H, s	12.5
5′	1.79, 3H, d (7.0)	14.6	0.91, 3H, dd (7.1, 5.5)	11.3	1.86, 3H, d (7.1)	14.9

^{a 1}H (500 MHz) NMR data of compounds.

^{b 1}H (600 MHz) NMR data of compound.

^cSignals were overlapped.