Table 1.

1D NMR data of (1) in CDCl₃- (¹H-NMR at 300 MHz; ¹³C-NMR at 75 MHz) and 1D NMR data of (2) in CDCl₃- (¹H-NMR at 400 MHz; ¹³C-NMR at 100 MHz).

N°	Compound 1		Compound 2
	δH integr, mult, (J in Hz)	δC mult.	δH integr, mult, (J in Hz)	δC mult.
1		41.0, C		45.6, C
2	2.77, 1H, s	63.7, CH	4.90, 1H, bs	76.0, CH
3a	3.51, 1H, d, (5.6)	57.2, CH	3.00. 1H, m	37.0, CH2
3b			2.12, 1H, m
4a	2.89, 1H, dd, (16.0, 6.5)	28.6, CH2	5.81, 1H, dd, (11.8, 6.1)	68.3, CH
4b	2.23, 1H, m
5		145.4, C		138.3, C
6	5.54, 1H, d, (10.1)	119.4, CH	6.81, 1H, d, (10.1)	138.0, CH
7	5.14, 1H, d, (10.1)	77.9, CH	5.61, 1H, d, (10.1)	76.0, CH
8		81.5, C		82.8, C
9	5.79, 1H, bs	70.4, CH	5.33, 1H, d, (1.2)	75.7, CH
10	3.59, 1H, bs	41.2, CH	2.91, 1H, d, (2.6)	32.5, CH
11		81.6, C	2.56, 1H, m	43.5, CH
12		194.8, C	5.26, 1H, dd, (12.5, 6.6)	67.0, CH
13a	6.00, 1H, d, (10.2)	124.1, CH	2.64, 1H, dd, (15.2, 7.5)	41.4, CH2
13b			2.52, 1H, dd, (15.2, 6.3)
14	6.67, 1H, d, (10.2)	153.6, CH	4.85, 1H, d, (8.2)	73.0, CH
15	0.94, 3H, s	14.4, CH3	1.15, 3H, s	14.9, CH3
16	3.76, 2H, bs	76.1, CH2		168.0, C
17	2.53, 1H, q, (6.5)	43.6, CH	2.56, 1H, m	43.5, CH
18	1.24, 3H, d, (6.5)	6.9, CH3	1.28, 3H, d, (6.4)	6.4, CH3
19		175.8, C		175.5, C
20	1.48, 3H, s	21.3, CH3	1.30, 3H, d, (7.1)	20.1, CH3
1’		166.8, C
2’	4.64, 2H, bs	61.2, CH2
3’		170.4, C
4’	2.21, 3H, s	20.3, CH3
AcO-2				170.8, C
			1.99, 3H, s	20.1, CH3
AcO-4				169.9, C
			2.01, 3H, s	21.4, CH3
AcO-9				169.2, C
			2.24, 3H, s	21.6, CH3
AcO-11		170.6, C
	2.05, 3H, s	21.5, CH3
AcO-12				170.3, C
			1.95, 3H, s	20.7, CH3
AcO-14				170.4, C
			1.98, 3H, s	21.1, CH3
OMe-16	3.34, 3H, s	58.7, CH3	3.84, 3H, s	53.0, CH3