Table 2.

¹H NMR data (500 MHz, δ in ppm, J in Hz) of 1–5.

Position	1 a	2 b	3 b	4 b	5 b
1	2.11, dd (12.9, 7.1)	1.56, dd (12.8, 7.5)	2.12, dd (12.8, 7.3)	3.95, m
	0.96, dd (12.9, 12.1)	0.85, dd (12.8, 12.8)	1.09, dd (12.7, 12.7)
2	1.98, m	2.60, m	2.24, m	1.96, m	4.46, t (6.2)
				1.19, ddd (12.6, 12.6, 1.7)
3				2.64, m	2.71, td (6.2, 1.7)
4	2.49, m	1.86, m	1.96, m	5.81, d (2.0)
	1.42, m	1.48, m	1.48, m
5	1.90, m	2.51, m	2.41, m		6.77, t (1.7)
	1.46, m	1.48, m	1.48, m
6	2.54, m	1.91, overlap	1.99, m	6.31, d (9.6)
7				5.48, d (9.6)
8	6.82, d (2.3)	6.97, d (2.2)	5.49, d (2.0)		3.87, s
9	2.92, m	2.88, m	2.81, m
10	2.66, dd (13.6, 8.9)	1.95, dd (13.7, 8.9)	2.59, dd (13.5, 8.2)	2.69, m
	1.59, dd (13.6, 1.9)	1.50, overlap	1.57, dd (13.5, 1.6)
12	1.25, s	1.24, s	1.22, s	5.46, d (6.0)
13			4.01, br d (14.3)	7.22, d (6.0)
			4.03, br d (14.3)
14		3.31, d (16.5)		1.46, s
		3.33, d (16.5)
15	1.18, s	0.96, s	1.26, s	1.17, s
16				1.04, d (7.2)

^a Taken in CD₃OD, ^b Taken in CDCl₃.