Table 1.

¹H NMR data for compounds 1–6 in CDCl₃ at 400 MHz

Position	1 (mult., J in Hz)	2 (mult., J in Hz)	3 (mult., J in Hz)	4 (mult., J in Hz)	5 (mult., J in Hz)	6 (mult., J in Hz)
1	α 1.92 (m)	α 1.86 (m)	α 1.90 (m)	α 1.76 (m)	α 1.67 (m)	α 2.89 (dd, 17.9, 14.5)
	β 1.68 (m)	β 1.64 (m)	β 1.68 (m)	β 2.22 (m)	β 2.32 (m)	β 2.66 (dd, 17.9, 3.1)
2	1.64 (m)	1.60 (m)	1.60 (m)	3.61 (m)	4.19 (m)
3	α 1.36 (td, 12.5, 5.4)	α 1.35 (td, 12.1, 4.3)	α 1.36 (m)	5.43 (d, 4.7)	5.27 (br s)	5.78 (s)
	β 1.50 (m)	β 1.46 (m)	β 1.52 (m)
6	α 2.12 (m)	α 2.12 (m)	α 2.16 (m)	α 1.79 (m)	α 1.80 (m)	α 2.16 (m)
	β 1.94 (m)	β 1.92 (m)	β 1.94 (m)	β 1.29 (m)	β 1.21 (m)	β 1.40 (m)
7	α 1.52 (m)	α 1.52 (m)	α 1.56 (m)	α 2.11 (m)	α 2.11 (m)	α 2.24 (m)
	β 1.70 (m)	β 1.66 (m)	β 1.72 (m)	β 1.47 (m)	β 1.47 (m)	β 1.56 (m)
8	1.78 (m)	1.73 (m)	1.75 (m)	1.61 (m)	1.55 (m)	1.62 (m)
10				1.95 (m)	1.62 (m)	1.90 (m)
11	1.98 (m)	1.98 (m)	2.00 (m)	1.94 (m) 2.23 (m)	1.92 (m) 2.25 (m)	1.94 (m) 2.18 (m)
12	2.10 (m) 2.27 (m)	2.02 (m) 2.15 (m)	2.03 (m) 2.18 (m)	2.32 (m) 2.57 (m)	2.34 (m)	2.33 (m)
14	6.27 (br s)	7.17 (t, 1.6)	6.83 (br s)	6.28 (br s)	6.28 (br s)	6.26 (br s)
15	7.34 (br s)	4.77 (d, 1.8)	5.74 (br s)	7.34 (br s)	7.35 (br s)	7.34 (br s)
16	7.22 (br s)			7.22 (br s)	7.23 (br s)	7.22 (br s)
17	0.95 (d, 6.7)	0.94 (d, 6.7)	0.94 (d, 5.6)	1.16 (d, 6.8)	1.15 (d, 6.9)	1.17 (d, 6.8)
18	1.04 (s)	1.04 (s)	1.03 (s)	1.65 (s)	1.62 (s)	1.90 (s)
19	1.00 (s)	1.00 (s)	0.99 (s)	0.91 (s)	0.99 (s)	1.08 (s)
2-OMe				3.34 (s)
15-OMe			3.49 (s)