... signalsindicated substitutions at O-3 of residue A, O-6 of residue B,O-3 and O-4 of residue C, O-3 of residue D,O-4andO- 6of residues E and F, O-6 of residue G, O-5 and O-4 of residueL,whereasI was a ... anomeric proton of GalN and H-3 of D.GalN is the branching point of the chain and, conse-quently, it should carry two sugar residues at O-3 and O-4.Indeed, the anomeric proton of b-glucose E ... A and C-1/H-1 D,H3/C-3D and C-1/H-1 C, H-1/C-1 E and C-3/H-3 C, H-1/C-1 F and C-4/H-4 C, H-1/C-1 G and C-6/H-6 B.The HMBC experiment was also crucial for theidentification and localization of...