Table 1.

1H NMR data of compounds 11, 17, and 21 (500 MHz, CDCl3)

Position	11	17	21
	δH, m, (J in Hz)	δH, m, (J in Hz)	δH, m, (J in Hz)
1	3.53 dd (11.5, 5.0)	1.86 m	1.48 m
		1.31 m	1.28 m
2	2.10 m	2.05 m	2.03 brdd (11.6, 4.5)
	1.95 m	2.00 m	1.98 m
3	5.06 dd (12.0, 4.5)	4.56 dd (12.0, 4.2)	4.56 dd (11.6, 4.5)
4	–	–	–
5	1.42 m	0.72 dd (10.0, 2.0)	0.73 brd (11.3)
6	1.65 m	1.38 m	1.38 m
	1.41 m	1.01 m	1.00 m
7	1.28 m	1.53 m	1.48 m
		0.87 m	1.31 m
8	–	–	–
9	2.27 d (8.5)	1.81 d (8.9)	1.68 d (9.2)
10	–	–	–
11	3.74 dd (8.5, 4.0)	4.13 dd (8.9, 3.5)	4.33 dd (9.4, 4.5)
12	5.45 d (4.0)	5.35 d (3.5)	5.23 d (4.0)
13	–	–	–
14	–	–	–
15	1.61 m	1.44 m	1.85 m
	1.21 m	0.89 m	1.78 m
16	1.52 m	1.41 m	1.38 m
		0.93 m	0.90 m
17	–	–	–
18	1.41 m	1.42 d (10.0)	1.41 m
19	1.36 m	0.95 m	0.87 m
20	0.96 m	1.34 m	1.34 m
21	1.32 m	3.45 ddd (10.0, 3.0, 3.0)	3.58 brdd (11.2, 2.5)
22	1.46 m	1.43 m	1.44 m
	1.31 m	1.28 m	1.30 m
23	0.95 s	0.86 s	0.87 s
24	0.88 s	1.05 s	1.10 s
25	1.07 s	0.87 s	0.87 s
26	1.02 s	1.08 s	1.04 s
27	1.16 s	1.15 s	1.16 s
28	0.82 s	0.80 s	0.80 s
29	0.84 d (6.5)	0.87 d (6.5)	0.88 d (6.4)
30	0.97 d (6.5)	0.88 d (6.5)	0.93 d (6.5)
1-OH	4.35 brs	–	–
21-OH	–	6.13 d (3.0)	–
11-OCH3	3.37 s	3.36 s	–
31	–	–	–
32	2.03 s	2.06 s	2.06 s