Table 2. NMR spectroscopic data for compounds 5 in CDCl₃ (400 MHz for ¹H and 100 MHz for ¹³C).

Position	5
	δ C, type	δ H mult. (J in Hz)
1	158.4, C	—
2	117.7, C	—
3	150.0, C	—
4	108.5, CH	7.01 d (0.4)
4a	155.4, C	—
5	128.8, C	—
6	160.3, C	—
7	94.9, CH	6.40 s
8	158.6, C	—
8a	102.1, C	—
9	184.5, C	—
9a	105.4, C	—
10a	149.2, C	—
11	20.9, CH3	2.15 s
1-OH	—	12.13 s
5-OCH3	61.7, CH3	3.91 s
6-OCH3	56.4, CH3	3.97 s
8-OH	—	11.94 s
1′	159.4, C	—
2′	116.0, C	—
3′	149.3, C	—
4′	110.0, CH	6.53 d (0.2)
4a′	157.5, C	—
5′	75.9, CH	4.12 d (9.9)
6′	75.5, CH	3.49 ddd (9.9, 9.5, 6.9)
7′	34.2, CH2	(a) 3.0 dd (18.6, 6.9)
		(b) 2.51 dd (18.6, 9.5)
8′	170.4, C	—
8a′	106.4, C	—
9′	187.7, C	—
9a′	104.8, C	—
10a′	80.5, C	—
11′	20.8, CH3	2.04 s
12′	21.5, CH3	1.56 s
1′-OH	—	11.64 s
5′-OH	—	2.94 br s
6′-OCH3	57.5, CH3	3.52 s
8′-OH	—	13.67 s