Table 2.

¹H NMR data for compounds 1–4 (400 MHz, CDCl₃).

No.	1	2	3	4
3	6.88 (d, 11.2)	6.88 (d, 11.2)	6.88 (d, 10.8)	6.76 (d, 11.2)
4	6.33 (ddq, 13.2, 11.2, 1.6)	6.31 (ddq, 14.8, 11.2, 1.6)	6.32 (ddq, 15.2, 10.8, 1.6)	6.27 (ddq, 14.8, 11.2, 1.6)
5	6.04 (dq, 13.2, 6.8)	6.02 (dq, 14.8, 6.8)	6.03 (dq, 15.2, 6.8)	5.97 (dq, 14.8, 6.8)
6	1.86 (d, 6.4)	1.85 (d, 6.8)	1.85 (d, 6.4)	1.85 (d, 6.8)
7	1.94 (s)	1.93 (s)	1.95 (s)	1.72 (s)
8	3.57 (dd, 10.8, 6.0); 3.72 (dd, 10.8, 3.2)	3.55 (dd, 10.8, 6.0); 3.71 (dd, 10.8, 3.2)		4.09 (dd, 11.2, 4.0); 4.20 (dd, 11.2, 5.2)
9	4.12 (m)	4.11 (m)	4.71 (td, 8.4, 5.2)	4.33 (m)
10	1.41 (dt, 8.4, 6.0)	1.31 (dd, 13.2, 6.0); 1.54 (dt, 13.2, 6.4)	1.58 (m); 1.70 (m)	1.24 (m)
11	1.66 (m)	1.44 (m)	1.67 (m)	1.52 (m)
12	0.95 (d, 6.8)	1.14 (t, 6.8); 1.39 (m)	0.95 (d, 6.4)	0.85 (d, 6.4)
13	0.94 (d, 6.8)	0.86 (t, 6.8)	0.95 (d, 6.4)	0.85 (d, 6.4)
14	5.77 (brd, 6.4)	0.92 (d, 6.4)	3.74 (s)
15		5.87 (brd, 7.2)	6.10 (d, 8.0)	5.54 (d, 8,8)
16				3.79 (s)
18				7.11 (s)
19				8.38 (brs)
21				7.34 (d, 8.0)
22				7.18 (dd, 8.0, 8.0)
23				7.11 (dd, 8.0, 8.0)
24				7.61 (d, 8.0)