Table 1.

¹H and ¹³C NMR data for 1 and 2.

	1		2
	1Ha	13Cb	1Ha	13Cb
1		148.3 (C)		146.7 (C)
2	6.06 d (10.8)	118.2 (CH)	6.19 d (10.8)	118.7 (CH)
3	6.15 d (10.8)	125.7 (CH)	6.29 d (10.8)	124.4 (CH)
4		129.3 (C)		130.5 (C)
5	3.20 d (13.6); 3.06 d (13.6)	54.7 (CH2)	3.90 d (13.6); 2.70 d (13.6)	48.9 (CH2)
6		209.8 (C)		208.0 (C)
7	2.54 dd (13.2, 8.4); 2.17 m	51.2 (CH2)	2.52 m; 2.12 m	52.4 (CH2)
8	2.03 m	31.2 (CH)	1.83 m	32.0 (CH)
9	1.48 m; 1.18 m	33.1 (CH2)	1.31 m; 1.14 m	33.3 (CH2)
10	1.92 m; 1.14 m	26.4 (CH2)	1.88 m; 1.09 m	26.4 (CH2)
11	2.71 dd (8.4, 4.0)	62.7 (CH)	2.49 m	64.4 (CH)
12		61.5 (C)		60.6 (C)
13	2.15 m; 1.32 m	36.7 (CH2)	2.12 m; 1.36 m	36.7 (CH2)
14	2.37 m; 2.28 m	25.9 (CH2)	2.73 m; 2.12 m	25.7 (CH2)
15	2.35 m	32.2 (CH)	2.35 m	30.8 (CH)
16	1.06 d (7.2)	22.6 (CH3)	1.18 d (6.8)	20.6 (CH3)
17	1.08 d (7.6)	22.1 (CH3)	1.02 d (6.8)	23.4 (CH3)
18	1.89 s	18.2 (CH3)	1.93 s	25.1 (CH3)
19	0.93 d (6.8)	19.5 (CH3)	0.85 d (6.4)	19.2 (CH3)
20	1.20 s	17.6 (CH3)	1.23 s	16.3 (CH3)

^aSpectra were recorded at 400 MHz in CDCl₃; J values (Hz) are given in parentheses;

^bspectra were recorded at 100 MHz in CDCl₃; attached protons were deduced by DEPT experiments.