Table 2.

¹H- and ¹³C-NMR spectroscopic data of compounds 3–4 (400 MHz for ¹H-NMR and 100 MHz for ¹³C-NMR, in DMSO-d₆, δ in ppm, J in Hz).

Position	3		4
	δH	δC	δH	δC
2	-	147.8	-	155.6
3	7.69 (1H, s)	115.6	-	137.7
4	-	176.0	-	178.1
5	-	154.8	-	155.3
6	-	108.4	-	108.8
7	-	166.2	-	166.3
8	6.52 (1H, s)	88.4	6.52 (1H, s)	88.6
9	-	156.1	-	156.3
10	-	103.9	-	105.1
1′	-	119.9	-	120.5
2′	-	146.9	7.55 (1H, d, J = 1.6 Hz)	115.5
3′	-	135.8	-	145.3
4′	-	145.1	-	148.8
5′	6.88 (1H, d, J = 8.8 Hz)	115.2	6.91 (1H, d, J = 8.4 Hz)	115.7
6′	7.54 (1H, d, J = 8.8 Hz)	122.0	7.44 (1H, dd, J = 1.6, 8.4 Hz)	120.8
1′′	3.06 (2H, d, J = 8.4 Hz)	25.8	3.05 (2H, d, J = 8.4 Hz)	25.8
2′′	4.73 (1H, t, J = 8. 4Hz)	91.5	4.74 (1H, t, J = 8.4 Hz)	91.6
3′′	-	70.1	-	70.1
4′′,5′′	1.16, 1.14 (6H, d)	25.0,25.9	1.15, 1.14 (6H, d)	24.9,25.9
3-OCH3	-	-	3.78 (3H, s)	59.7
5-OH	12.76 (1H, s)	-	12.92 (1H, s)	-