Table 2.

¹H NMR data for compounds 1–4 (600 MHz, δ ppm, J in Hz).

No.	1 a	2 b	3 a	4 b
1			4.48, dd (10.0, 2.0)	4.72, dd (10.5, 1.3)
2	6.36, d (5.0)	6.63, d (6.4)	3.63, m (10.0, 9.4, 5.0)	3.36, ddd (10.5, 7.3, 3.7)
3	5.50, dd (5.0, 5.0)	4.14, ddd (6.4, 5.3, 4.2)	1.61, m	5.23, dd (3.7, 3.7)
4	2.12, m	1.80, qd (7.0, 4.2)	2.04, m	1.74, qd (6.9, 3.7)
6	6.28, s	a: 2.33, d (14.6)	a: 2.88, d (13.7)	a: 1.89, d (14.4);
		b: 1.89, d (15.1)	b: 2.26, d (13.7)	b: 1.83, d (14.4)
9	6.76, s	6.28, s	6.41, d (2.0)	5.94, d (1.3)
11	1.42, s
12	1.18, d (6.8)	3.70, dd (6.0, 5.8)	2.11, s	a: 3.89, d (10.4);
				b: 3.53, d (10.4)
13		1.39, s	1.87, s	1.35, s
14	2.13, s	1.20, brs	1.04, s	1.19, s
15		1.04, d (7.0)	1.02, d (6.4)	0.84, d (6.9)
16				3.30, s
18				2.08, s
2-OH				5.69, d (7.3)
3-OH		5.27, d (5.3)
7-OH	6.32, brs
12-OH		4.81, t (5.8)

^a Resolved in CDCl₃. ^b Resolved in DMSO.