Table 1.

¹H and ¹³C-NMR data^a of compound 2 in CDCl₃

Atom n°	1H NMR	13C NMRc		COSY	HMBC
1		39.8	Cq
2	2,20 m	52.7	CH	3
3	1,56 m	33.4	CH2	2, 4
4	2,02 m	41.5	CH	3
5	1,60–1,57 mb	27.2	CH2
6	1,50–1,45 mb	39.7	CH2
7	1.08 s	16.6	CH3		8
8	5.82 dd (11.0, 18.0)	150.0	CH	9a, 9b	7
9a	4.91 d (18.0)	110.0	CH2	8	1, 8
9b	4.90 d (11.0)			8	1, 8
10		147.4	Cq
11a	4.82 br s	112.3	CH2		2, 12
11b	4.58 br s				2, 12
12	1.70 s	24.8	CH3	11a, 11b	10, 11
13		136.8	Cq
14		168.7	Cq
15	6.33 d (14.0)	134.3	CH	16	4, 14, 17
16	6.97 dd (14.0, 15.0)	123.6	CH	15, 17
17	6.05 d (15.0)	146.7	CH	16	15, 18, 19/20
18		71.0	Cq
19	1.36 s	29.6	CH3		17, 18
20	1.36 s	29.6	CH3		17, 18
21	3.79 s	51.6	CH3		14

^a1H NMR, 400 MHz; ¹³C NMR, 100 MHz; chemical shifts are given in δ values relative to CHCl₃ as internal standard and coupling constants in Hz are in parentheses.

^bThese protons appears as very broad multiplets in the proton spectrum. H₂-5 and H₂-6 data may be interchanged.

^cCarbon atom multiplicity was deduced by DEPT.