Table 1.

¹H (850 MHz) and ¹³C NMR (212.5 MHz) data of compounds 1 and 1a in CD₃OD (δ in ppm) ^a.

Position	1		1a
	δH (J in Hz)	δ C	δH (J in Hz)	δ C
1	3.86 dd (1.5, 1.5)	72.2 d	3.82 dd (1.0, 1.0)	72.0 d
2α	2.55 ddd (13.0, 5.5, 1.5)	37.7 t	2.01 ddd (13.0, 5.5, 1.0)	37.6 t
2β	2.40 ddd (13.0, 12.5, 1.5)		1.73 ddd (13.0, 12.5, 1.0)
3	4.09 dddd (12.5, 12.5, 5.5, 5.5)	73.8 d	3.91 dddd (12.5, 12.5, 5.5, 5.5)	65.1 d
4α	2.23 dd (13.0, 5.5)	36.1 t	2.36 dd (13.0, 5.5)	40.9 t
4β	1.85 dd (13.0, 12.5)		2.32 dd (13.0, 12.5)
5		142.7 s		142.9 s
6	5.77 d (4.0)	126.2 d	5.72 d (4.0)	126.0 d
7	3.75 t (4.0)	64.4 d	3.72 t (4.0)	64.5 d
8	1.44 m	37.0 d	1.46 m	37.0 d
9	1.92 m	33.4 d	1.92 m	33.8 d
10		41.8 s		41.6 s
11α	1.57 m	19.5 t	1.51 m	19.3 t
11β	1.52 m		1.56 m
12α	1.37 m	39.2 t	2.00 m	39.3 t
12β	2.01 m		1.36 m
13		42.3 s		42.1 s
14	1.57 m	49.6 d	1.57 m	49.8 d
15α	1.86 m	23.1 t	1.19 m	22.3 t
15β	1.22 m		1.84 m
16α	1.70 m	21.5 t	1.69 m	21.3 t
16β	1.91 m		1.91 m
17	1.82 m	54.3 d	1.82 m	54.1 d
18	0.89 s	12.6 q	0.89 s	12.6 q
19	1.02 s	17.5 q	1.02 s	17.3 q
20		74.9 s		75.0 s
21	1.29 s	19.5 q	1.28 s	19.3 q
22	4.27 dd (13.5, 3.5)	81.2 d	4.25 dd (13.5, 3.5)	81.0 d
23α	2.32 m	30.8 t	2.32 m	30.8 t
23β	2.56 m		2.54 t (15.0)
24		151.5 s		151.2 s
25		120.6 s		120.6 s
26		167.8 s		167.6 s
27	1.87 s	11.1 q	1.87 s	10.8 q
28	2.01 s	19.2 q	2.00 s	19.1 q
1′	4.40 d (8.0)	101.8 d
2′	3.18 dd (9.0, 8.0)	73.8 d
3′	3.38 overlap	76.4 d
4′	3.28 overlap	70.3 d
5′	3.49 overlap	75.6 d
6′	4.14 dd (12.0, 2.0); 3.80 dd (12.0, 6.0)	68.5 t
1″	4.41 d (8.0)	103.5 d
2″	3.23 (9.0, 8.0)	73.8 d
3″	3.36 overlap	76.4 d
4″	3.30 overlap	70.0 d
5″	3.28 overlap	76.5 d
6″	3.88 dd (12.0, 2.0); 3.69 dd (12.0, 5.5)	61.3 t

^a J values are in parentheses (shown in Hz); ¹³C NMR assignments were based on HSQC and HMBC experiments.