TABLE 1.

¹H and ¹³C NMR data of compounds 2 and 3.

No.	2a		2b		3b
	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)	δC, type	δH (J in Hz)
1	NH	7.69, br s
2	174.4, C		177.3, C		177.4, C
3	78.8, C		80.8, C		80.8, C
4	76.1, CH	3.89, t (5.9)	77.9, CH	4.12, d (6.6)	78.0, CH	4.12, d (6.5)
5	59.5, CH	3.16, ddd (5.9, 5.5, 3.5)	61.2, CH	3.38, ddd (6.6, 5.8, 3.2)	61.2, CH	3.38, ddd (6.5, 5.8, 3.3)
6	61.6, CH2	3.54, ddd (11.1, 5.0, 3.5) 3.30, ddd (11.1, 5.5, 5.0)	62.9, CH2	3.76, dd (11.6, 3.2) 3.52, dd (11.6, 5.8)	62.9, CH2	3.76, dd (11.6, 3.3) 3.52, dd (11.6, 5.8)
7	73.0, CH	4.22, dd (6.5, 5.9)	74.5, CH	4.43, d (7.1)	74.6, CH	4.43, d (7.0)
8	130.8, CH	5.82, dd (15.4, 6.5)	129.6, CH	5.83, dd (15.4, 7.1)	129.6, CH	5.82, dd (15.4, 7.0)
9	131.0, CH	6.14, dd (15.4, 10.6)	134.6, CH	6.32, dd (15.4, 10.4)	134.6, CH	6.32, dd (15.4, 10.5)
10	130.2, CH	6.00, dd (15.1, 10.6)	131.2, CH	6.07, dd (15.0, 10.4)	131.2, CH	6.07, dd (15.0, 10.5)
11	133.6, CH	5.62, dt (15.1, 7.3)	136.3, CH	5.70, dt (15.0, 7.3)	136.3, CH	5.70, dt (15.0, 7.3)
12	32.0, CH2	2.04, q (7.3)	33.7, CH2	2.08, q (7.3)	33.6, CH2	2.08, q (7.3)
13	28.8, CH2	1.34, m	30.5, CH2	1.39, m	30.4, CH2	1.39, m
14	29.0, CH2	1.24, m	30.7, CH2	1.29, m	30.7, CH2	1.31, m
15	28.9, CH2	1.24, m	30.6, CH2	1.29, m	30.6, CH2	1.31, m
16	28.7, CH2	1.24, m	30.5, CH2	1.29, m	30.5, CH2	1.31, m
17	28.6, CH2	1.24, m	30.3, CH2	1.29, m	30.3, CH2	1.31, m
18	31.3, CH2	1.23, m	33.1, CH2	1.28, m	26.9, CH2	1.35, m
19	22.1, CH2	1.25, m	23.7, CH2	1.31, m	33.7, CH2	1.52, m
20	13.9, CH3	0.85, t (6.9)	14.4, CH3	0.90, t (7.0)	63.0, CH2	3.54, t (6.7)
3-OH		5.03, s
4-OH		5.47, d (5.9)
6-OH		4.74, t (5.0)
7-OH		4.75, d (5.9)

^aRecorded at 600 (¹H) and 150 MHz (¹³C) in DMSO-d₆. ^bRecorded at 600 (¹H) and 150 MHz (¹³C) in CD₃OD.