Table 1.

NMR Spectral Data for 1 at 500 MHz (¹H) and 125 MHz (¹³C) in CDC1₃.

#	δ C	δH(J in Hz)	HMBC
1	65.6	4.13 br s	C-20, C-4, C-6
2	123.9	5.65 d (4.5)
3	139.7
4	32.0	1.92–1.98 m	C-2, C-3, C-5, C-6
		1.98–2.01 br dd (18, 5)
5	20.9	1.68–1.73 m	C-1
		1.42 m
6	44.6	1.11–1.17 m
7	33.8	1.60–1.64 m
8	33.9	1.28–1.30 m	C-9
9	29.5	1.29–1.30 m	C-8, C-15, C-10
		1.34–1.35 m
10	58.7	1.18–1.24 m	C-15
11	85.9
12	32.6	1.40–1.43 m	C-13, C-14, C-11
		1.85–1.87 ddd (12.2, 8.4, 4.3)
13	39.6	1.49–1.52 dddd (24, 12, 5.3, 1.2)	C-15, C-12, C-14
		1.59–1.63 m
14	84.9
15	49.3	1.32–1.34 m	C-16, C-9, C-13, C-10
16	19.7	0.94 d (6.6)	C-15, C-10, C-14
17	18.6	1.29 s	C-13, C-14, C-15
18	21.1	1.37 s	C-12, C-10, C-11
19	17.7	0.97 d (6.7)	C-7, C-8, C-6
20	23.8	1.71 s	C-4, C-2, C-3
OH		1.02 d (7.1)	C-2

¹³C assignments from HMQC data. HMBC correlations from ambiguous overlapping resonances are not presented.