Table 1.

¹H (400 MHz: m, J Hz) and ¹³C (100 MHz) NMR spectral data of isolated compounds C₁–C₄ in CDCl₃.

No.	C-1		C-2		C-3		C-4
	13C	1H	13C	1H	13C	1H	13C	1H
2	155.8 s		155.8 s		156.1 s
3	139.2 s		139.3 s		139.5 s
4	179.1 s		179.5 s		179.5 s
5	149.9 s		148.9 s		153.1 s
6	131.2 s		130.5 s		130.6 s
7	149.6 s		148.1 s		149.2 s
8	118.2 s		127.2 s		136.2 s			6.61 s
9	144.3 s		145.1 s		145.1 s
10	104.3 s		105.2 s		107.6 s
1′	130.1 s		128.5 s		132.9 s
2′	128.1 d	7.29 br s	128.3 d	8.15 br s	128.4 d	8.17 br s		8.19 d, 7.2
3′	128.4 d	8.02 br s	128.8 d	7.65 br s	128.8 d	7.56 br s		7.45 m
4′	130.9 d	7.29 br s	131.1 d	7.65 br s	131.2 d	7.56 br s		7.45 m
5′	128.4 d	8.02 br s	128.8 d	7.65 br s	128.8 d	7.56 br s		7.45 m
6′	128.1 d	7.29 br s	128.3 d	8.15 br s	128.4 d	8.17 br s		8.19 d, 7.2
1″	165.5 s
2″	126.4 s
3″	140.9 d	6.36 q, 6.8
4″	15.8 q	2.13 d, 6.8
5″	20.3 q	2.16 s
OMe-3	60.2 q	3.88 s	60.4 q	3.90 s	60.4 q	3.91 s		3.89 s
OMe-6	60.6 q	4.11 s	61.1 q	4.09 s	61.2 q	3.98 s		3.92 s
OMe-7					62.2 q	4.14 q		4.06 s
OMe-8			61.8 q	4.02 s	61.7 q	3.98 s
5-OH		12.65 s		12.55 s		12.37		11.37
7-OH		6.58 br s		6.80 br s