Table 1.

¹H NMR data of compounds 51–54 in DMSO-d₆

	δH (J in Hz)
Position	51a	52a	53b	54b
3	3.15, m	3.25, m	3.20, m	3.21, m
5	5.19, s	5.18, s	5.19, s	5.17, s
6	1.79c	1.78c	1.79c	1.78 c
7ax	0.82, m	0.81, m	0.80, m	0.80, m
7eq	1.78c	1.77c	1.77c	1.77 c
8	1.49, m	1.48, m	1.48, m	1.48, m
9ax	1.70, m	1.70, m	1.70, m	1.70, m
9eq	1.01c	1.00c	1.01, m	0.97, m
10ax	1.00c	0.98c	0.95, m	0.94, m
10eq	1.89, m	1.90, m	1.93, m	1.93, m
11	1.57, m	1.57, m	1.54, m	1.53, m
12	1.33, s	1.36, s	1.33, s	1.35, s
13	5.22, m	5.16, m	5.15, m	5.11, dd (10.4, 14.7)
14	5.71, m	5.79c	5.72, dd (10.5, 14.7)	5.78, dd (10.5, 14.7)
15	5.88, m	5.82c	5.90, dd (10.5, 13.7)	5.86, dd (10.5, 13.7)
16	5.50, m	5.46, m	5.50, m	5.46, m
17	2.00, m	1.99, m	1.63, d (6.5)	1.62, d (6.5)
	2.09, m	2.08, m
18	3.57, m	3.57, m	1.52, s	1.51, s
19	0.98, d (6.0)	0.98, d (6.0)	0.88, d (6.3)	0.88, d (6.3)
20	1.52, s	1.52, s
21	0.88, d (6.5)	0.88, d (6.5)
1’			9.25, s	9.05, s
5’	3.75, br s	3.71c	3.80, br s	3.78, br s
6’	3.81, d (11.0)	3.81, m	3.63, dd (2.1, 11.0)	3.67, dd (2.1, 11.0)
	3.69, m	3.72c	3.59, m	3.61, m
N-Me	2.92, s	2.91, s

^aRecorded at 500 MHz

^bRecorded at 400 MHz

^cOverlapped signals determined from HSQC correlations.