Table 1.

¹H- (500 MHz) and ¹³C-NMR (125 MHz) data of compound 1 (in CDCl₃, δ in ppm, J in Hz).

No.	δ c	δ H	HMBC (H to C)
1	165.4	–	–
2	–	–	–
3	45.3	3.51 (m)	C-1, 4, −5, −6
		3.61 (m)	C-1, 4, −5, −6
4	22.6	2.00 (m)	C-3, −5, −6
		2.06 (m)	C-3, −5, −6
5	28.1	2.34 (m)	C-4, −6, −7
			C-4, −6, −7
6	59.0	4.11 (t, 7.5)	C-4, −5, −7
7	170.2	–	–
8	–	6.73 (s)	–
9	65.6	4.36 (dt, 6.5, 3.0)	C-7, −11
10	59.4	3.97 (d, 3.0)	C-1, −9, −11
11	18.9	1.34 (d, 6.5)	C-9, −10
12	–	1.89 (m)	–