Table 1.

NMR data for compound 1.

Position	δH a (J in Hz)	δC b, Type	HMBC	COSY	NOESY
1		160.7, C
2	5.57, dd (10, 2.0)	78.2, CH		3, 17	18
3	5.08, d (10.4)	121.1, CH	5, 18	2, 18	5a
4		144.5, C
5a	2.39, m	37.7, CH2	3, 4, 6, 18	5b, 6a	3, 5b, 7
5b	2.41, m		3, 4, 6, 18	5a, 6a	5a,18
6a	1.92, m	22.9, CH2		6b, 5a, 5b	6b
6b	1.72, m			6a, 7	6a,18, 19
7	2.56, br d (6.4)	62.4, CH	6	6b	9a, 10a
8		61.3, C
9a	0.97, m	38.2, CH2	10	9b	9b, 11
9b	2.22, m		11	9a, 10a, 10b	7, 9a, 19
10a	2.11, m	25.9, CH2	12	9a, 10b	7, 10b
10b	2.19, m			9a, 10a, 11	10a
11	6.80, dd (10.4, 4.8)	142.0, CH	10, 13, 20	10a	9b
12		131.1, C
13	2.36, m	25.2, CH2	12, 20	14b
14a	2.50, m	27.0, CH2	1, 2, 15	14b	14b
14b	2.11, m			13a, 14a	14a
15		124.2, C
16		174.4, C
17	1.90, s	8.6, CH3	1, 15, 16	2
18	1.87, s	15.3, CH3	3, 4, 5	3	2, 5b
19	1.30, s	16.8, CH3	7, 8, 9		6b, 9b
20		166.9. C
21	4.23, m	60.8, CH2	20	22	22
22	1.33, t (7.2)	14.3, CH3	21	21	21

^a Spectra were measured in CDCl₃ (400 MHz); ^b Spectra were measured in CDCl₃ (100 MHz).