Table 1.

¹H and ¹³C NMR data of 1 and 2 (δ in ppm, J in Hz).

Position	1 a		2 b
	δH	δC	δH	δC
2	-	171.1	-	171.1
3	5.63 (br.s)	115.3	5.52 (d, 1.9)	116.5
4	-	152.0	-	164.9
5	-	141.5	-	89.3
6	5.60 (m)	107.4	1.65 (m), 1.92 (m)	36.0
7	2.63 (m), 2.34 (dd, 2.5, 17.5)	40.8	2.23 (m), 1.60 (m)	35.7
8	-	47.0	-	49.1
9	2.68 (m)	49.4	2.65 (m)	50.1
10	1.48 (m), 1.93 (m)	29.7	1.46 (m), 1.91 (m)	29.6
11	1.51 (m), 1.94 (m)	23.1	1.58 (m), 1.65 (m)	22.0
12	1.59 (m)	55.6	1.53 (m)	56.3
13	0.71 (s)	12.4	0.60 (s)	12.1
14	2.13 (m)	41.1	2.11 (br. s)	41.2
15	1.08 (d, 6.9)	21.5	1.08 (d, 6.9)	21.5
16	5.27 (dd, 7.7, 15.1)	136.4	5.28 (dd, 7.6, 14.6)	136.4
17	5.30 (dd, 7.2, 15.1)	133.1	5.30 (dd, 7.2, 14.6)	133.1
18	1.90 (m)	43.8	1.90 (m)	43.8
19	1.51 (m)	33.9	1.50 (m)	33.9
20	0.84 (d, 6.9)	20.1	0.85 (d, 6.9)	20.1
21	0.87 (d, 6.9)	20.4	0.88 (d, 6.9)	20.4
22	0.95 (d, 6.8)	18.2	0.96 (d, 6.9)	18.2
1′	3.64 (m)	42.8	3.32 (m), 3.60 (m)	42.5
2′	3.63 (m)	61.1	3.66 (m)	62.3
5-OH			5.12 (br.s)	-
2′-OH	3.87 (br.s)	-	4.36 (br.s)	-

^a Measured in CD₃COCD₃ at 300 MHz for ¹H and 75 MHz for ¹³C NMR; ^b Measured in CD₃COCD₃ at 600 MHz for ¹H and 125 MHz for ¹³C NMR.