Table 2.

NMR data for derivative (5) in CDCl₃.

Carbon	δCa	δH, multiplicity (Hz)b	COSY	HMBC (1H to 13C)	NOESY
1	161.6
2	145.6
3	127.8	8.09, s		1, 2, 4
4	169.2
5	37.7	a3.12, dd (14.4, 1.8)	6, 5b	4, 6, 7	17
		b3.22, dd (14.4, 10.2)	6, 5a	4, 6, 7	17
6	77.5	3.70, d (9.6)	5a, 5b, 7	4, 5, 8, 10, 17	8, 10
7	39.2	1.95, m	6, 8, 17	8, 9, 17
8	76.7	3.43, dd (10.2, 4.8)	7, 9	9, 16, 17	6, 10, 16
9	33.9	1.68, m	8, 10, 16	8, 10	15, 17
10	83.2	2.88 dd (10.2, 1.8)	9, 11	6, 8, 11, 12, 15, 16	6, 8, 16
11	33.2	1.66, m	10, 15, 12a, 12b	12, 13, 15	14
12	37.1	a1.24, m	11, 12b	10, 11, 13, 14, 15	15
		b1.33, m	11, 12a	10, 11, 13, 14, 15	15
13	20.4	1.16, m	14	11, 12, 14
14	14.4	0.79, t (7.2)	13	12, 13	11
15	13.1	0.87, d (7.2)	11	10, 11, 12	9, 12a, 12b
16	13.0	0.88, d (6.0)	9	8, 9, 10	8, 10
17	5.6	0.96, d (6.6)	7	6, 7, 8	5a, 5b, 9
18	52.5	3.95, s		1, 2

^aRecorded at 125 MHz.

^bRecorded at 500 MHz.