Table 1.

Selected ¹H NMR data (δ ppm, J in parenthese in Hz) for compounds 1–3, 5 and 6.

Pos	1	2	3	5	6
2	7.11 (d, J = 7.5)	7.32 (d, J = 8.3)		7.45 (d, J = 8.4)	7.48 (d, J = 8.4)
3	6.92 (dd, J = 1.5, 7.5)	7.90, m		7.00, m	7.00, m
5	7.01 (d, J = 1.5)	7.90, m	5.44 (d, J = 4.4)	7.00, m	7.00, m
7	2.68, m	–	1.16, m	2.58, m	2.68, m
11	2.22, m	3.71, m	1.96, m	1.99, m	2.01, m
12	0.71 (d, J = 7.0)	1.37 (d, J = 6.8)	0.80 (d, J = 7.0)	0.76 (d, J = 6.9)	0.70 (d, J = 6.6)
13	0.99 (d, J = 7.0)	1.37 (d, J = 6.8)	0.87 (d, J = 7.0)	1.04 (d, J = 6.9)	1.02 (d, J = 6.6)
14	1.24 (d, J = 6.7)	2.63, s	0.96 (d, J = 6.6)	1.51, s	1.48, s
15	2.28, s	2.54, s	1.70, s	2.95, s	2.30, s

1: 2.74 (m, H-10); 2: 7.19 (d, J = 8.0, H-8), 7.25 (d, J = 8.0, H-8); 5: 1.58 (m, H-10); 6: 1.69 (m, H-6).