Table 1.

¹H- and ¹³C-NMR data of compounds 1 and 2 ^a.

No.	1 b		2 c
	1H	13C	1H	13C
1		170.33 s		172.31 s
2	2.61 dd (17.6, 5.1)	38.66 t	2.54 dd (17.7, 3.5)	37.81 t
	2.73 dd (17.6, 3.7)		2.71 dd (17.7, 4.7)
3	4.38 m	62.83 d	4.25 m	61.96 d
4	1.73 m	36.13 t	1.72 m	35.14 t
	1.95 m		1.93 m
5	4.68 tdd (7.9, 5.2, 3.0)	75.68 d	4.69 m	76.46 d
6	1.59 m	35.49 t	1.61 m	35.32 t
	1.73 m		1.70 m
7	1.41 m	25.11 t	1.36 m	24.86 t
8	1.30 m	26.39 t	1.37 m	26.49 t
9	1.08 m	36.55 t	1.19 m	38.58 t
	1.30 m		1.40 m
10	1.54 m	29.88 d	1.66 m	28.37 d
11	0.93 m	44.79 t	1.30 m	48.71 t
	1.22 m		1.48 m
12	1.45 m	30.11 d		72.37 s
13	1.14 m	32.67 t	1.45 m	38.19 t
	1.35 m		1.60 m
14	1.38 m	36.55 t	1.47 m	33.19 t
	1.48 m		1.52 m
15	3.76 m	68.56 d	3.69 m	67.85 d
16	1.19 d (6.9)	23.54 q	1.16 d (6.2)	22.17 q
17	0.85 d (6.4)	20.28 q	1.15 s	25.91 q
18	0.84 d (6.4)	20.26 q	0.97 d (6.6)	21.01 q

^aMeasured at 500 MHz for ¹H and 125 MHz for ¹³C with reference to the solvent signals, δ in ppm and J in Hz;

^bMeasured in CDCl₃;

^cMeasured in CD₃OD.