Table 1.

¹H- (800 MHz) and ¹³C- (200 MHz) NMR data for compounds 1, 2, and 3 (in CDCl₃) at 25 °C.

Position	1			2			3
	δC (ppm)	δH, m (J in Hz)	HMBC (H→C)	δC	δH, m (J in Hz)	HMBC (H→C)	δC	δH, m (J in Hz)	HMBC (H→C)
2	164.2			164.6			164.2
3	105.5	6.57 s	C-2, C-4, C-4a, C-1′	106.2	6.74 s	C-2, C-4, C-4a, C-1′	105.5	6.71 s	C-2, C-4, C-4a, C-1′
4	182.9			182.6			183.0
4a	105.2			105.4			105.3
5	161.3			164.2			161.4
5-OH		13.08 s	C-4a, C-5, C-6		13.41 s	C-4a, C-5, C-6		13.11 s	C-4a, C-5, C-6
6	95.3	6.40 s	C-4a, C-5, C-7, C-8	95.6	6.40 s	C-4a, C-5, C-7, C-8	95.4	6.45 s	C-4a, C-5, C-7, C-8
7	163.1			165.0			163.2
8	105.3			103.4			106.0
8a	154.1			156.0			154.2
1′	131.5			131.5			131.5
2′,6′	126.5	7.91 m	C-2, C-4′, C-2′, C-6′	126.5	7.92 m	C-2, C-4′, C-2′, C-6′	126.4	7.93 m	C-2, C-4′, C-2′, C-6′
3′,5′	129.1	7.52 m	C-1′, C-3′, C-5′	129.4	7.59 m	C-1′, C-3′, C-5′	129.2	7.54 m	C-1′, C-3′, C-5′
4′	131.9	7.55 m	C-2′, C-6′	132.2	7.59 m	C-2′, C-6′	132.0	7.56 m	C-2′, C-6′
1″	114.9	6.85, d (16.5)	C-7, C-8a, C-2″, C-3″	132.0	8.06, d (16.4)	C-7, C-8a, C-2″, C-3″	117.5	6.83, d (16.5)	C-7, C-8a, C-2″, C-3″
2″	141.3	6.70, d (16.5)	C-8, C-3″, 3″-Me2	128.8	7.18, d (16.4)	C-8, C-3″, C-4″	135.4	6.29, d (16.5)	C-8, C-3″, C-4″, C-5″
3″	71.5			199.1			142.9
3″-Me2	30.0	1.50 s	C-2″, C-3″, 3″-Me2
4″				27.8	2.41 s	C-2″, C-3″	116.8	5.10 s	C-2″, C-3″, C-5″
5″							18.2	2.06 s	C-2″, C-3″, C-4″
7(OMe)	56.1	3.92 s	C-7	56.4	4.01 s	C-7	56.2	3.97 s	C-7