TABLE 1.

¹H and ¹³C NMR data (δ in ppm, J in Hz) for compounds 1, 2, and 3^a.

NO.	1		2		3
	δ Hb	δ Cc	δ H	δ C	δ H	δ C
1-NH	7.09, s		7.19, s		7.16, s
2		73.4 C		75.3 C		75.5 C
3		196.9 C		195.3 C		195.3 C
3a		114.4 C		113.3 C		113.4 C
4	7.26, d (8.6)	124.9 CH	7.27, d (8.6)	124.9 CH	7.26, d (8.6)	124.8 CH
5	6.26, dd (8.6, 2.2)	107.3 CH	6.28, dd (8.6, 2.2)	107.5 CH	6.28, dd (8.6, 2.2)	107.5 CH
6		166.8 C		167.1 C		166.9 C
7	6.44, d (2.2)	94.4 CH	6.46, d (2.2)	94.6 CH	6.46, d (2.2)	94.7 CH
7a		163.5 C		163.8 C		163.9 C
8	4.38, s	74.4 CH	4.43, s	74.4 CH	4.47, s	74.1 CH
9		85.2 C		85.1 C		85.4 C
11		169.5 C		167.0 C		168.6 C
12	4.43, dd (8.7, 6.8)	59.8 CH		88.8 C	4.40, dd (9.0, 7.2)	59.7 CH
13	1.90, m; 2.23, m	27.8 CH2	2.07, m	35.8 CH2	2.19, t (2.2); 1.83, m	27.8 CH2
14	1.85, m; 1.93, m	22.7 CH2	1.93, m	20.2 CH2	1.86, m	22.6 CH2
15	3.34, dt (11.6, 7.7)	44.6 CH2	3.48, m	44.5 CH2	3.46, m	44.5 CH2
17		164.6 C		165.6 C		164.8 C
18	4.14, dd (7.6, 1.8)	58.8 CH	4.63, d (9.5)	61.0 CH	4.61, d (9.6)	60.7 CH
19	1.37, dd (14.4, 1.8) 2.60, dd (14.4, 7.6)	38.5 CH2	4.99, m	120.9 CH	4.93, dt (9.6, 1.4)	121.1 CH
20		68.3 C		133.7 C		133.6 C
21	0.99, s	30.2 CH3	1.30, s	18.0 CH3	1.38, d (1.4)	17.9 CH3
22	0.84, s	29.1 CH3	1.58, s	25.4 CH3	1.57, d (1.4)	25.4 CH3
23	3.78, s	55.4 CH3	3.80, s	55.4 CH3	3.79, s	55.4 CH3
8-OH	5.63, s				5.64, s
9-OH	6.95, s				7.05, s
20-OH	4.06, s

^aRecorded in DMSO-d_6. ^bRecorded at 600 MHz. ^cRecorded at 150 MHz.