Table 1.

¹H-NMR and ¹³C-NMR data for compound 1 (in CD₃OD, 400 MHz for ¹H-NMR and 100 MHz for ¹³C-NMR).

No.	δH J (Hz)	δ C	No.	δH J (Hz)	δ C
2	3.54, d, 4.9	80.4, CH	14	0.72, s	6.7, CH3
3	4.22, dd, 4.9, 3.1	77.8, CH	15	4.34, d, 12.5	65.9, CH2
4	5.78, d, 3.1	83.9, CH		4.12, d, 12.5
5		49.8, C	16	1.74, s	20.2, CH3
6		44.0, C	17		172.3, C=O
7	2.43, dd, 15.3, 6.0	29.0, CH2	18	2.08, s	20.6, CH3
	1.85, d, 15.3		19		172.1, C=O
8	5.34, d, 6.0	69.1, CH	20	2.05, s	20.9, CH3
9		137.1, C	1’		177.3, C=O
10	5.80, d, 5.8	124.8, CH	2’	2.33, m	42.3, CH
11	4.41, d, 5.8	68.2, CH	3’	1.65, dq, 13.6, 7.4	27.6, CH2
12		65.3, C		1.50, dq, 13.6, 7.4
13	3.02, d, 3.9	47.7, CH2	4’	0.92, t, 7.4	11.7, CH3
	2.85, d, 3.9		5’	1.14, d, 7.0	16.5, CH3

Proton coupling constants (J) in Hz are given in parentheses. The assignments were based on ¹H-¹H COSY, HSQC and HMBC experiments.