Table 1.

¹H and ¹³C NMR data for (±)-1‒3 in MeOH-d₄.

No.	(±)-1		(±)-2		(±)-3
	δH (J in Hz)a	δCb	δH (J in Hz)a	δCb	δH (J in Hz)a	δCb
1	7.80 s	109.8	8.19 s	102.8	7.81 s	109.7
2		150.0		154.2		150.0
3		158.0		158.4		158.1
4	7.03 s	110.5	7.57 s	105.1	7.04 s	110.5
4a		138.1		140.5		138.3
5	3.25 ddd (16.8, 8.4, 6.6)	27.3	8.08 d (6.6)	123.8	3.26 ddd (16.8, 8.4, 6.6)	27.3
	3.13 ddd (16.8, 10.8, 6.6)				3.15 ddd (16.8, 10.8, 6.6)
6	4.33 ddd (15.0, 10.8, 6.6)	49.2	8.66 d (6.6)	132.7	4.34 ddd (15.0, 10.8, 6.6)	49.6
	4.16 ddd (15.0, 8.4, 6.6)				4.17 ddd (15.0, 8.4, 6.6)
8	5.78 d (3.6)	64.5	6.53 (3.6)	65.2	5.77 d (3.6)	64.1
8a		115.5		115.3		114.2
9		145.0		145.3		145.6
10		150.0		149.8		149.8
11	6.93 d (7.8)	110.2	6.93 d (7.8)	110.4	6.92 d (7.8)	110.0
12	6.97 d (7.8)	120.7	7.03 d (7.8)	120.6	7.04 d (7.8)	121.8
12a		127.5		129.3		126.9
13	5.80 d (3.6)	46.0	6.17 d (3.6)	43.5	5.40 d (3.6)	48.1
13a		176.2		154.6		175.9
13b		118.6		124.7		118.5
2′	4.63 dd (8.4, 3.6)	60.2	4.63 dd (8.4, 3.6)	60.4	4.27 dd (8.4, 3.6)	55.9
3′	3.38 m	44.1	3.34 m	44.4	3.43 m	38.3
4′a	2.23 ddd (20.4, 13.8, 10.2)	27.1	2.31 ddd (20.4, 13.8, 10.2)	27.2	2.60 dd (18.6, 10.8)	32.9
4′b	1.65 ddt (13.8, 7.8, 1.8)		1.81 ddt (13.8, 7.8, 1.8)		1.80 dd (18.6, 3.6)
5′a	3.43 td (10.2, 2.4)	48.9	3.50 td (10.2, 2.4)	48.9		178.0
5′b	1.94 td (10.2, 7.8)		2.10 td (10.2, 7.8)
6′		172.0		172.1
7′	1.93 s	22.5	1.98 s	22.6
2,3-OCH2O-	6.23 s	105.0	6.41 s	105.8	6.23 d (1.2)	105.1
	6.21 s		6.39 s		6.21 d (1.2)
9,10-OCH2O-	6.14 s	104.0	6.17 d (1.2)	104.1	6.13 d (1.2)	104.1
	6.11 s		6.09 d (1.2)		6.10 d (1.2)

^a1H NMR data (δ) were measured in 600 MHz NMR instrument. Proton coupling constants (J) in Hz are given in parentheses.

^bData were recorded at 150 MHz. The assignments were based on ¹H‒¹H COSY, HSQC, HMBC, and NOESY experiments.