Table 1. ¹H NMR (400 MHz) and ¹³C NMR (100 MHz) Spectroscopic Data for Compound F-7 (1) in CDCl₃.

c.·no.	δH	δC	HMBC correlations
1		159.3
1′		160.2
9a		106.9b
9a′		106.3
9		190.3
9′		187.1
8a		72.5
8a′		101.5
8		198.7
8′		177.6
7	3.17 dd (15.1, 13.6), 2.37–2.33 s	39.7	198.7, 31.3, 18.01
7′	2.74 dd (18.8, 5.9) 2.33–2.29	36.3	177.6, 101.5, 77.2, 17.07
6	2.04–1.99 m	31.3
6′	2.47–2.37 m	29.7	17.07
5	4.38 brs	75.0	72.5, 39.7, 86.2
5′	3.93 d (11)	77.2	29.7, 84.2, 17.07, 170.3
10		86.2
10′		84.2
4a		158.4
4a′		156.7
4a	6.61 d (8.6)	107.6	106.9, 119.1
4′a	6.60 d (8.4)	106.9b	106.3, 117.7
3	7.50 d (8.5)	140.4	117.7, 159.3, 158.4
3′	7.46 d (8.5)	140.3	119.1, 160.2, 156.7
2		119.1
2′		117.7
11	1.21 d (6.6)	18.01	39.7, 31.3, 75.0
11′	1.17 d (6.3)	17.07	36.3, 29.7, 77.2
12		168.5
12′		170.3
13	3.69 s	53.2	168.5
13′	3.72 s	53.8	170.3
–OH-1	11.88 s		160.2, 106.3, 117.7
–OH-2	11.71 s		159.3, 106.9, 119.1

^aOverlapped signals in ¹H NMR spectra.

^bOverlapped signals in ¹³C NMR spectra.