Table 2. NMR Data of Compounds 3 and 4 in CDCl₃ at 400 MHz (¹H) and 100 MHz (¹³C).

position		3		4
		δH, mult. (J in Hz)	δC (type)	δH, mult. (J in Hz)	δC (type)	HMBCa
1	α	1.453, ddd (−13.1, 5.2, 5.1)	37.95 (CH2)	1.351, ddd (−13.7, 1.5, 1.3)	34.90 (CH2)	2, 3, 4, 16
	β	2.303, ddd (−13.1, 9.1, 9.0)		1.945, ddd (−13.7, 9.5, 8.8)		2, 14, 15, 16
2		2.801–2.873, m	39.82 (CH)	2.364 dqd (8.8, 7.5, 1.3)	33.80 (CH)	3, 4, 15, 16
3		5.887, s br	144.53 (CH)	3.304, s	72.93 (CH)	2, 5
4			138.38 (C)		67.58 (C)
5		6.147, s br	128.11 (CH)	5.513, q (1.6)	128.35 (CH)	3, 4, 7, 15, 17
6			135.91 (C)		145.55 (C)
7			210.63 (C)		208.41 (C)
8	α	2.896, dd (−13.0, 2.1)	38.30 (CH2)	2.945, dd (−12.7, 1.8)	38.01 (CH2)	7, 9 10, 13
	β	2.519, dd (−13.1, 13.0)		2.577, dd (−13.3, 12.7)		6, 7, 9
9		2.430 dd (13.1, 2.1)	51.34 (CH)	2.508, dd (13.3, 1.8)	52.84 (CH)	10, 13, 18, 19, 20
10			37.44 (C)		37.57 (C)
11	α	2.462 d (−16.7)	55.46 (CH2)	2.424, d (−12.0)	55.52 CH2	9, 10, 12, 19
	β	2.326 d (−16.7)		2.424, d (−12.0)
12			218.01 (C)		217.23 (C)
13			64.55 (C)		65.72 (C)
14			215.66 (C)		215.52 (C)
15		4.123, dddd (9.1, 5.1, 2.9, 1.5)	51.02 (CH)	3.656, dd (9.5, 1.5)	46.65 (CH)	2, 3, 13, 14
16		1.126, d (7.0)	20.54 (CH3)	1.156, d (7.5)	16.12 (CH3)	1, 2, 3
17		1.947, s broad	20.68 (CH3)	1.945, d (1.6)	20.54 (CH3)	5, 6, 7
18		1.238, s	27.92 (CH3)	1.277, s	28.29 (CH3)	9, 10, 11, 19
19		0.921, s	23.59 (CH3)	0.969, s	23.67 (CH3)	9, 10, 18
20		1.479, s	14.04 (CH3)	1.441, s	14.60 (CH3)	9, 13

^aIndicates ²J and ³J interactions.