Proton No. S1 S2 S3 S4 S5
1 1.72 0.98 m - - 1.70 1.00 m 1.73 1.01 m
2 2.10 1.85 - - 2.07 1.85 2.12 1.87
3 3.87 m 3.03 m 3.42 m 3.98 m 3.93 m
4 2.74 m     2.77 m 2.71 m
6 5.37 br.s 5.33 br.s 5.32 br.s 5.32 br.s 5.38 br.s
7 1.35 1.35 - - 1.50 1.50 1.90 1.51
8 1.50 - - 1.51 1.54
9 0.89 - - 0.90 0.90
11 1.45 1.45 - - 1.45 1.45 1.45 1.45
12 1.73 1.13 - - 1.73 1.12 1.70 1.10
14 1.08 2.09 - - 1.07 2.07 1.10 2.10
16 4.50 - - 4.38 4.51 m
17 1.87 - - 1.85 1.83
18 0.88 0.66 0.69 0.88 0.88
19 1.04 0.96 0.95 1.04 1.06
20 1.91 m 1.09 d (J=7)     1.98 m 1.09 d (J=7) 2.01 m 1.17 d (J=7)
21 - 0.92 d (J=6.3) 0.98d (J=5.7) - -
22 - - 5.16 dd (J=8.6,15.1) - -
23 1.73 1.73 - 5.02 dd (J=8.6,15.1) 1.73 1.73 1.70 1.70
24 1.65 1.65 - - 1.63 1.63 1.65 1.65
25 1.48 2.77 - - 1.50 2.77 1.48 2.83
26 2.82 0.81 d (J=6.3) 0.81 d  J=5.7) 2.77 2.83
27 0.81 d (J=6) 0.90 d ( J=6.3) 0.78 d (J=5.7) 0.82 d (J=6) 0.81 d (J=6)
29 - 0.78 t (J=6.3) 0.89 t (J=7.3) - -
1` - 4.21 d (J=7.5) 4.21 d (J=7.8) 4.95 d (J=8) 4.93 d (J=8)
1`` - - - 6.39 br.s 6.23 br.s
1``` - - - 5.85 br.s 5.15 d (J=8)
Table 1: 1H NMR chemical shifts (δ ppm) for compound S1 (CDCl3, 300 MHz, J in HZ) and S4-S5 (DMSO, 300 MHz, J in HZ)