Table 2.

¹H and ¹³C NMR (CDCl₃, 300 MHz and 75 MHz), COSY, HMBC and NOESY assignment for compound 2.

Position	δC, Type	δH, (J in Hz)	COSY	HMBC	NOESY
1
2	171.9, CO
3	113.0, CH	5.68, s		C-2, 3a, 4, 7a
3a	181.3, C
4	35.1, C
5α	49.7 CH2	2.02, ddd (12.8, 4.3, 2.3)	H-5β,	C-3a, 4, 6, 7
β		1.31, dd (12.2, 12.2)		C-4, 6, 7a, 10	H-5α
6	64.8, CH	4.10, m	H-5α, 5β, 7α, 7β,		H-5α, 7α, 7β, 8, 10
7α	47.8 CH2	2.51, ddd (11.8, 4.0, 2.3)	H-6, 7β	C-3a, 5, 6, 7a
β		1.48, dd (11.8, 11.8)		C-5, 6, 7a, 8
7a	86.8 C
8	25.5, CH3	1.56, s	H-7β	C-3a, 7, 7a	H-6
9	29.9, CH3	1.29, s		C-3a, 4, 5, 10
10	25.0, CH3	1.24, s		C-3a, 4, 5, 9