Table 1.

¹H-NMR (500 MHz) and ¹³C-NMR (125 MHz) data for 1, 1a, 1b, and 2 (δ ppm).

No.	1 a		1a b		2 a
	δH (J in Hz)	δC	δH (J in Hz)	δC	δH (J in Hz)	δC
1		42.5		46.1		42.5
2α	1.74 (d, 15.5)	34.0	1.63 (d, 15.0)	33.6	1.64 (d, 15.5)	33.3
2β	2.45 (dd, 2.5, 15.5)		2.40 (dd, 3.5, 15.0)		2.46 (dd, 3.5, 15.5)
3	4.72 (m)	80.2	4.63 (m)	79.6	4.68 (m)	79.7
4	2.02 (m)	51.5	1.96 (m)	51.5	2.02 (m)	51.4
5	2.35 (m)	45.5	2.27 (m)	45.5	2.50 (m)	45.0
6	2.36 (m)	41.7	2.26 (m)	41.3	2.39 (d, 3.0)	49.1
7	1.25 (s)	31.9	1.15 (s)	31.7	1.28 (s)	32.7
8	1.83 (m)	25.0	1.76 (m)	24.8	1.81 (m)	25.3
9	0.99 (d, 6.0)	19.3	0.96 (d, 6.0)	19.6	0.99 (d, 6.5)	19.8
10	1.01 (d, 6.0)	20.0	0.98 (d, 6.0)	20.7	1.03(d, 6.5)	20.9
11α	2.31 (m)	34.2	2.31 (m)	34.7	4.45 (m)	81.9
11β	2.23 (m)		2.02 (m)
12α	4.90 (t, 7.5)	79.4	4.77 (t, 7.4)	81.7	2.75 (m)	39.4
12β					2.92 (dd, 8.0, 18.5)
13		158.2		156.4		156.3
14a	5.21 (d, 1.5)	111.5	5.19 (d, 1.5)	112.9	4.91 (d, 8.0)	106.1
14b	5.42 (d, 1.5)		5.44 (d, 1.5)		4.88 (d, 8.0)
15		180.6		179.0		178.6
1′	4.35 (d, 7.5)	101.5	4.56 (d, 8.0)	100.4	4.33 (d, 7.5)	102.4
2′	3.22 (m)	73.5	4.96 (m)	75.1	3.27 (s)	73.5
3′	3.40 (m)	76.6	5.18 (t, 10.0)	73.2	3.44 (m)	76.4
4′	3.39 (m)	70.2	5.05 (t, 10.0)	68.5	3.44 (m)	69.7
5′	3.29 (m)	76.2	3.68 (m)	71.9	3.29 (m)	75.7
6′a	3.87 (dd, 2.5, 12.0)	61.6	4.26 (dd, 5.0, 12.0)	62.2	3.87 (dd, 3.0,12.0)	61.6
6′b	3.75 (dd, 5.5, 12.0)		4.12 (dd, 2.0, 12.0)		3.78 (dd, 3.0,12.0)
2′-Ac			2.03 (s)	169.0/20.7
3′-Ac			1.99 (s)	170.8/20.8
4′-Ac			2.01 (s)	169.3/20.7
6′-Ac			2.08 (s)	170.6/20.6

^a,b: Data were recorded in MeOH-d₄, and CDCl₃, respectively.