Table 1.

¹H and ¹³C NMR data of 3 (400 MHz for ¹H; 100 MHz for ¹³C, CDCl₃) and 6 (700 MHz for ¹H; 175 MHz for ¹³C, CDCl₃)

Position	3		6
	δ C *	δH mult (J in Hz)	δ C	δH mult (J in Hz)
1			168.8
2	161.4
3	128.4		83.3	4.43, ddd (8.6, 3.4, 2.9)
4	137.6	7.95, s	67.4	4.78, dd (8.6, 2.3)
4a	109.6		141.9
5	100.0	6.70, s	116.1	7.07, d (7.5)
6	151.8		137.1	7.53, dd (8.0, 7.5)
7	118.1		117.8	6.98, d (8.0)
8	146.1		162.2
8a	137.9		106.8
9	57.4	3.92, s
10	56.9	3.95, s
1’	41.1	2.64, dd (13.7, 8.2)	30.7	1.76, m
		2.83, dd (13.7, 3.7)		1.92, m
2’	66.7	4.16, m	18.4	1.75, m
				1.90, m
3’	23.7	1.28, d (6.4)	42.9	2.56, ddd (9.2, 6.3, 2.9)
4’			209.2
5’			30.3	2.16, s
4-OH				2.76, br. s.
8-OH				10.91, s

^*13C NMR data for 3 were obtained from HMBC and edited-HSQC spectra.