Table 1.

The ¹H and ¹³C NMR data of 1–3 in DMSO-d₆. ^a

Position	1a b		2a c		2b c		3a c		3b c
	δH (J in Hz)	δC	δH (J in Hz)	δC	δH (J in Hz)	δC	δH (J in Hz)	δC	δH (J in Hz)	δC
1	—	170.0 s	—	170.8, s	—	171.3 s	—	170.8 s	—	171.4 s
2	—	86.6 s	—	88.2 s	—	89.5 s	—	88.2 s	—	89.4 s
3	3.29 (dd, 12.2, 6.0)	47.2 d	3.78 (dd, 9.2, 9.0)	47.0 d	3.88 (dd, 9.0, 8.4)	46.6 d	3.81 (dd, 9.4, 8.9)	47.3 d	3.87 (dd, 9.0, 8.4)	46.6 d
4	4.60 (d, 6.0)	39.1 d	4.98 (d, 9.0)	36.9 d	5.02 (d, 9.0)	36.2 d	4.99 (d, 8.9)	36.9 d	5.01 (d, 9.0)	36.2 d
5	—	171.5 s	—	169.3 s	—	168.9 s	—	168.9 s	—	168.9 s
7	—	156.7 s	—	156.78 s	—	156.75 s	—	156.8 s	—	156.7 s
8	6.86 (s)	108.3 d	6.79 (s)	108.3 d	6.77 (s)	108.3 d	6.81 (s)	108.3 d	6.79 (s)	108.3 d
9	—	147.5 s	—	147.5 s	—	147.5 s	—	147.47 s	—	147.51 s
10	6.69 (s)	112.5 d	6.64 (s)	112.3 d	6.64 (s)	112.3 d	6.65 (s)	112.3 d	6.65 (s)	112.3 d
11	—	159.8 s	—	159.87 s	—	159.85 s	—	159.9 s	—	159.8 s
12	—	108.5 s	—	108.4 s	—	108.4 s	—	108.4 s	—	108.4 s
13	—	179.7 s	—	178.87 s	—	178.89 s	—	178.8 s	—	178.9 s
14	—	119.3 s	—	119.2 s	—	118.7 s	—	119.3 s	—	118.7 s
15	2.35 (s)	21.5 q	2.30 (s)	21.5 q	2.28 (s)	21.4 q	2.30 (s)	21.45 q	2.29 (s)	21.42 q
16	3.71 (s)	52.7 q	3.69 (s)	52.8 q	3.70 (s)	52.6 q	3.68 (s)	52.6 q	3.70 (s)	52.5 q
1′	—	168.1 s	—	169.4 s	—	167.7 s	—	169.2, s	—	167.4 s
2′	—	102.8 s	—	105.7 s	—	106.2 s	—	105.7 s	—	106.1 s
3′	2.63 (tdd, 12.2, 4.3, 1.3)	45.5 d	3.10 (ddd, 10.1, 9.2, 6.4)	42.7 d	2.79 (ddd, 12.5, 8.4, 5.9)	47.3 d	3.09 (ddd, 10.3, 9.4, 6.5)	42.9 d	2.79 (ddd, 11.3, 8.4, 6.6)	47.2 d
4′α	2.91 (dd, 16.8, 12.2)	28.4 t	2.70 (dd, 17.0, 6.4)	26.3 t	2.48 (dd, 15.9, 5.9)	26.9 t	2.69 (dd, 16.9, 6.5)	26.3 t	2.48 (dd, 15.9, 6.6)	27.0 t
β	2.83 (dd, 16.8, 4.3)		2.64 (dd, 17.0, 10.1)		2.43 (dd, 15.9, 12.4)		2.64 (dd, 16.9, 10.3)		2.44 (dd, 15.9, 11.3)
5′	—	169.0 s	—	168.0 s	—	167.4 s	—	168.1 s	—	167.1 s
7′	—	155.5 s	—	155.5 s	—	155.6 s	—	155.5 s	—	155.6 s
8′	6.91 (s)	107.4 d	6.90 (s)	107.6 d	6.88 (s)	107.6 d	6.92 (s)	107.6 d	6.91 (s)	107. 7 d
9′	—	147.7 s	—	147.40 s	—	147.44 s	—	147.40 s	—	147.43 s
10′	6.72 (s)	111.8 d	6.71 (s)	112.0 d	6.71 (s)	112.0 d	6.72 (s)	111.9 d	6.72 (s)	111.9 d
11′	—	159.4 s	—	159.52 s	—	159.55 s	—	159.5 s	—	159.5 s
12′	—	107.3 s	—	107.7 s	—	107.8 s	—	107.8 s	—	107.7 s
13′	—	181.4 s	—	179.4 s	—	179.3 s	—	179.4 s	—	179.3 s
14′	—	113.1 s	—	111.9 s	—	111.7 s	—	111.9 s	—	111.8 s
15′	2.39 (s)	21.8 q	2.38 (s)	21.77 q	2.38 (s)	21.79 q	2.39 (s)	21.8 q	2.38 (s)	21.8 q
16′	3.67 (s)	52.4 q	3.74 (s)	52.28 q	3.75 (s)	52.31 q	4.25–4.18 (m)	61.3 t	4.17–4.12 (m)	61.2 t
17′	—	—	—	—	—	—	1.26 (t, 7.1)	13.8 q	1.26 (t, 7.1)	14.0 q
11–OH	12.20 (s)	—	12.15 (s)	—	12.12 (s)	—	12.16 (s)	—	12.13 (s)	—
2′–OH	7.96 (d, 1.3)	—	7.80 (s)	—	7.53 (s)	—	7.74 (s)	—	7.49 (s)	—
11′–OH	12.50 (s)	—	12.49 (s)	—	12.47 (s)	—	12.50 (s)	—	12.48 (s)	—

^a The ¹H and ¹³C NMR signals were recorded in δ values using the solvent DMSO-d₆ signals (δ_H 2.50/δ_C 39.52) as references, respectively. ^b Recorded at 400 MHz ¹H and 150 MHz ¹³C NMR. Except for the ¹H signals of 1a given in this Table, additional very weak ¹H signals of minor isomer 1b (δ4.74, d, J = 8.5 Hz, H-4; δ12.28, br s, HO-11; δ7.83, br s, HO-2′; δ12.53, br s, HO-11′) were also detected in the ¹H NMR spectrum of 1 although full ¹H signals were hardly recognized for 1b. The ratio of 1a and 1b was determined approximately to be 1:0.2 by the standard integrals of their H-4 and HO-2′ signals. ^c Recorded at 600 MHz ¹H and 150 MHz ¹³C NMR. The signals of 2a and 2b for 2 were assigned on the basis of HMQC, HMBC, NOESY, and 1D GOESY experiments. The signals of 3a and 3b for 3 were assigned by comparison with the data of 2a and 2b, coupled with the result of NOESY experiments for 3. The ratio of 2a/2b and 3a/3b were approximately determined both to be 1:0.8 by the standard integrals of H-4, HO-2′ and H-3′ signals for 2 and H-3 and H-3′ signals for 3, respectively.