Table 1.

¹H and ¹³C NMR spectroscopic data of compounds 1–3.

Position	1 a		2 a		3 b
	δC, mult.	δH ( J in Hz)	δC, mult.	δH ( J in Hz)	δC, mult.	δH ( J in Hz)
1α	30.6, CH2	1.98, m	28.8, CH2	2.12, ddd (13.0, 13.0, 4.1)	32.0, CH2	2.18, ddd (13.5, 13.5, 4.7)
1β		1.53, m		1.59, m		1.85, ddd (13.5, 4.2, 1.6)
2	17.7, CH2	1.65, 2m	25.7, CH2	1.78, 2m	26.7, CH2	1.74, 2m
3	41.4, CH2	1.55, m; 1.45, m	76.8, CH	3.42, dd (11.4, 4.5)	77.7, CH	3.40, dd (11.1, 5.0)
4	35.4, C		40.7, C		41.8, C
5	142.8, C		143.3, C		145.6, C
6	144.4, C	6.73, s (OH)	145.0, C		144.9, C
7	181.6, C		182.1, C		183.3, C
8	133.7, C		133.8, C		134.9, C
9	74.1, C		73.6, C		76.1, C
10	45.1, C		44.6, C		46.7, C
11α	25.2, CH2	1.81, ddd (12.4, 3.2, 2.4)	25.5, CH2	1.74, m	65.8, CH
11β		1.93, ddd (12.4, 12.4, 3.2)		2.03, ddd (13.6, 13.6, 3.0)		4.23, dd (12.1, 4.2)
12α	29.5, CH2	1.88, ddd (12.4, 12.4, 3.2)	29.1, CH2	1.92, ddd (13.6, 13.6, 3.0)	39.9, CH2	1.79, m
12β		1.58, m		1.59, m		1.65, ddd (12.1, 4.2, 1.9)
13	38.8, C		38.4, C		40.1, C
14	147.9, CH	7.04, d (1.8)	147.9, CH	6.95, d (1.8)	147.0, CH	6.94, d (1.8)
15	145.4, CH	5.87, dd (17.5, 10.7)	145.4, CH	5.94, dd (17.5, 10.7)	146.1, CH	5.89, dd (17.5, 10.7)
16a	112.6, CH2	5.10, dd (17.5, 0.7)	111.3, CH2	5.13, dd (17.5, 0.9)	112.3, CH2	5.13, dd (17.5, 0.8)
16b		5.06, dd (10.7, 0.7)		5.07, dd (10.7, 0.9)		5.05, dd (10.7, 0.8)
17	23.3, CH3	1.13, s	22.3, CH3	1.15, s	24.0, CH3	1.18, s
18	30.1, CH3	1.41, s	24.9, CH3	1.55, s	25.9, CH3	1.54, s
19	26.9, CH3	1.29, s	18.1, CH3	1.25, s	19.0, CH3	1.21, s
20	29.4, CH3	1.21, s	28.7, CH3	1.22, s	29.2, CH3	1.24, s

^a Measured in CDCl₃; ^b Measured in CD₃OD. 500 MHz for ¹H NMR; 125 MHz for ¹³C NMR.