Table 1.

¹H NMR Spectroscopic Data for 2–6 (400 MHz, CDCl₃, δ ppm, J in Hz)^a,^b

number	2	3	4	5	6
1	1.79, m	1.56, m	2.04, m	1.50, m	1.25, m
	1.60, m	0.80, m	1.96, m	1.26, m	1.10, m
2	1.79, m	1.46, m	2.00, m	1.50, m	1.59, m
	1.44, m	1.25, m	1.71, m	1.20, m	1.24, m
3	2.29, m	1.56, m	2.36, m	1.84, m	1.34, m
	2.09, m		2.25, m	1.66, m	1.09, m
5					1.00, m
6	1.81, m	1.83, m	2.12, m	2.19, m	1.52, m
	1.44, m	0.92, m	1.15, m	0.93, m	1.47, m
7	1.79, m	1.80, m	1.55, m	2.04, m	1.62, m
	1.19, m	1.17, m	1.51, m	1.37, m
8	1.44, m	1.53, m	1.87, m	1.66, m	2.04, m
10	1.67, m	1.79, m
11	4.68, s	1.00, s	4.82, s	1.17, s	0.88, s
	4.61, s		4.70, s
12	1.19, s	0.52, d, (4.0)	1.15, s	0.65, d (4.2)	0.86, s
		0.03, d, (4.0)		0.36, d (4.2)
13	1.02, d (6.7)	1.17, d (6.8)	1.00, d (6.8)	0.91, d (7.3)	1.21, dc
14	0.82, s	0.89, s	0.95, s	1.20, s	1.22, sc
15	2.65, d (13.2)	2.66, d (13.2)	2.58, d (18.8)	2.30, d (19.1)	3.50, d (15.8)
	2.40, d (13.2)	2.35, d (13.2)	2.04, d (18.8)	2.19, d (19.2)	2.78, d (15.8)
17					7.15, s
19	5.79, s	5.83, s	5.73, s	5.73, s
23					3.88, s
HO-17		7.48, s
HO-19					11.06, s
HO-20					5.45, br s
CH3O-20	3.80, s	3.84, s	3.80, s	3.80, s

^aAssignments based on HSQC.

^bAll spectra recorded in CDCl₃.

^cResonances overlapped.