Table 1.

¹H (600 MHz) and ¹³C (151 MHz) NMR data for compound 4 in CDCl₃

Position	δH, m(J in Hz)	δC	HMBC
2		160.9
3	6.16, d, (7.1)	111.0	C-8a, C-2
4	7.96, d, (7.1)	138.8	C-5a, C-2, C-5
5		128.8
6	6.33, d (1.5)	91.3	C-8a, C-5, C-8, C-7
7		156.6
8		152.3
8a		103.9
5a		149.0
1′	4.54, dd (7.5, 1.5)	70.0	C-2′, C-5, C-3′
2′	5.57, d (1.5)	120.2	C-4′, C-5′
3′		139.0
4′	1.68, s	18.0	C-5′, C-2′, C-3′
5′	1.73, s	25.8	C-4′, C-2′, C-3′
7-OCH3	3.94, s	56.4	C-7
8-OCH3	3.90, s	56.4	C-8