¹H NMR spectroscopic data for compounds 1–6^a (δ in ppm, J in Hz).

No.	1	2	3	4	5	6
1	1.88, 1.19	1.58	1.85, 1.18	1.86, 0.85	2.17, 0.67, t, (12.0)	2.19, 0.70, t, (12.0)
2	1.85, 1.43, m	2.13, 1.57, m	1.86, 1.42, m	1.91, 1.42, m	4.08, m	4.09, m
3	2.16, 1.05, m	3.99, overlap	2.16, 1.04, m	2.13, 1.04, m	2.41, 0.96, t, (12.2)	2.41, 0.97, t, (12.3)
5	1.05, m	1.47, m	1.06, m	1.17, m	1.11, m	1.11, m
6	1.84, 1.70, m	1.76, m	1.85, 1.75, m	1.90, 1.78, m	1.93, 1.81, m	1.95, m
7	1.54, 1.25, m	1.78, 1.21, m	1.56, 1.22, m	1.74, 1.39, m	1.67, 1.36, m	1.82, 1.34, m
9	1.72	1.68	1.70	1.16	1.06	1.19
11	4.09, overlap	4.28, overlap	4.33, overlap	1.93, m	1.71, 1.23, m	1.77, 1.47, m
12	4.14, overlap	2.00, d, (11.4), 1.82	2.00, d, (11.2), 1.80	4.09, m	1.69, m	1.89, 1.69, m
13	2.14	2.19	2.45	2.41, m	2.44, m	3.07, m
14	1.95, d, (12.7), 1.19	1.95, d, (12.3), 1.14	1.97, d, (12.3), 1.11	2.33, d, (12.5), 1.48	2.45, overlap, 1.43	2.43, overlap, 1.40
15	2.82, s	2.87, s	3.06, s
16				2.59, m	2.30, m
17	1.34, s	1.27, s	3.59 dd, (11.5, 5.8)	1.25, d, (7.2)	1.09, d, (7.2)	5.89, 5.32, s
19	1.19, s	1.24, s	1.19, s	1.21, s	1.27, s	1.27, s
20	0.99, s	1.01, s	1.02, s	0.98, s	1.04, s	1.06, s

^aNMR data were measured at 500 MHz in CD₃OD for 1–6.