Table 2.

¹H NMR spectroscopic data of compounds 1‒3 (400 MHz, CDCl₃) and 4 (400 MHz, DMSO-d₆).

No.	1	2	3	4
2	-	4.87 d (11.2)	-	5.53 d (10.4)
3	2.16 br s	5.26 dd (10.8, 0.8)	5.21 s	4.99 d (10.4)
5	3.04 q (10.8)	2.34 m	2.09 m	2.18 m
	1.67 m	-	1.78 m	-
6	2.00 dd (9.6, 2.4)	1.92 m	1.54 m	1.97 m
	1.54 m	1.63 m	1.51 m	1.42 m
7	3.80 dd (9.2, 5.6)	2.65 t (4.0)	3.52 dd (9.2, 3.2)	3.01 dd (10.0, 2.8)
9	1.50 m	2.13 m	1.64 m	1.73 m
	1.25 m	0.93 m	1.47 m	1.49 m
10	2.05 m	2.27 m	2.17 m	1.62 m
	1.90 m	1.87 m	1.86 m	1.34 m
11	5.15 t (7.6)	5.11 dd (9.6, 5.6)	4.99 t (6.8)	3.13 d (10.4)
13	2.28 br d (13.2)	2.22 m	2.28 m	1.70 m
	1.84 m	1.95 m	-	1.49 m
14	2.61 td (13.2, 2.1)	1.69 m	2.56 m	2.45 m
	2.12 m	-	-	1.91 m
16	4.90 br s	3.89 d (10.4)	-	-
	-	3.75 d (10.4)	-	-
17	2.08 s	1.43 s	1.94 s	1.73 s
18	1.35 s	1.84 s	1.40 s	1.77 s
19	1.03 s	1.27 s	1.61 s	0.98 s
20	1.69 s	1.57 s	1.67 s	0.98 s