Table 2. Nuclear Magnetic Resonance (NMR) Spectroscopic Data (600 MHz, DMSO) for 5 and 6.

	5		6
position	δC	δH (J in Hz)	δC	δH (J in Hz)
1	158.9	14.18, s	158.0
2	103.4		110.6
3	157.1		162.4
4	93.6	6.32, s	104.3
4a	155.6		152.6
5	100.0	6.73, s	147.6
6	152.1	11.18, s	120.6	7.28, dd (7.8, 1.3)
7	141.0	8.69, s	124.0	7.24, t (7.8)
8	129.9		114.6	7.55, dd (7.8, 1.3)
8a	110.1		120.3
9	181.7		180.8
9a	102.9		102.2
10a	152.8		146.5
11	114.8	6.60, d (10.0)	21.4	3.28, d (7.0)
12	127.8	5.72, d (10.0)	122.4	5.18, d (7.4)
13	77.9		130.8
14	29.1	1.20, s	25.6	1.61, s
15	29.1	1.20, s	17.9	1.67, s
16	43.6	1.57, m	29.2	3.21, dd (14.7, 3.2), 3.03, dd (14.8, 7.7)
17	21.9	3.30, dd (9.7, 6.8)	74.6	4.32, m
18	69.3	1.3, s	144.9
19	27.9	1.42, s	109.8	4.86, s; 4.72, s
20	27.9	1.42, s	18.5	1.81, s