Table 2.

NMR data for compound 2.

Position	δH a (J in Hz)	δC b, Type	HMBC	COSY	NOESY
1		147.1, C
2	6.53, d (11.0)	118.4, CH	4, 14, 15	3	16, 17, 18
3	6.08, d (11.0)	123.8, CH	5, 18	2, 18	5a, 7, 13a
4		135.8, C
5a	2.12, m	37.8, CH2	3	5b, 18	3, 5b
5b	1.97, m		3	5a, 6b, 18	5a, 6b, 18
6a	1.94, m	25.5, CH2	7	6b, 7	6b
6b	1.17, m			5b, 6a, 7	5b, 6a,19
7	2.67, dd (10.8, 2.8)	62.1, CH		6a, 6b	3, 9a
8		60.6, C
9a	0.85, td (12.4, 4.0)	39.7, CH2	8, 19	9b, 10a, 10b	9b, 7
9b	1.95, m		8, 10, 19	9a, 10a, 10b	9a, 19
10a	2.16, m	26.7, CH2		9, 10b, 11	10b
10b	1.75,m		9, 11, 12	9, 10a, 11	10a, 19
11	6.89, dd (10.4, 6.8)	141.1, CH	20	10a, 10b	9
12		133.9, C
13a	2.26,m	28.4, CH2			3, 13b, 14b
13b	2.38, m		11, 12, 20		13a
14a	2.52, m	28.6, CH2	12		14b, 17
14b	2.24, m		12		14a
15		73.6, C
16	1.33, s	29.5, CH3	1, 15, 17		2
17	1.44, s	29.3, CH3	1, 16, 17		2
18	1.58, s	15.6, CH3	3, 4, 5	3, 5a, 5b	2, 5b
19	1.04, s	15.6, CH3	7, 8, 9		6b, 9b, 10b
20		167.6, C
21	3.42, s	51.2, CH3	20

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