Table 3 Selected signals in the 1H-NMR spectra of the RG-II monomer before and after base treatment
RG-II residue/group protons | 1H chemical shifts (ppm) | |
|---|---|---|
RG-II monomer | Base-treated RG-II monomer | |
Methyl-ester protons | 3.81, 3.84 | nd |
Acetyl protons | 2.16, 2.22 | nd |
2Me-α-L-Fucp-(1 → 2 H6 | 1.14 | 1.22 |
 → 2)-α-L-AcefA-(1 → 3 H5 | 1.22 | 1.21 |
2Me-α-L-Fucp-(1 → 2 H1 | 5.79 | 5.75 |
-5)-α-D-Kdo-(2 → 3 H3, H3’ | 1.88, nd | 1.88, 2.2 |
-5)-β-D-Dha-(2 → 3 H3, H3’ | 1.95, nd | 1.95, 2.2 |