pent-4-enyl (methyl 2-O-acetyl-3-O-benzyl-4-O-tert-butyldimethylsilyl-α-L-idopyranosyluronate)-(1->4)-(6-O-acetyl-2-azido-3-O-benzyl-2-deoxy-α-D-glucopyranosyl)-(1->4)-methyl 3-O-benzyl-2-O-levulinoyl-β-D-glucopyranosyluronate

methyl 3-O-benzyl-α-L-idopyranuronate

methyl 3-O-benzyl-β-L-idopyranuronate

methyl 3-O-benzyl-β-L-idopyranuronate 1,2-(tert-butyl orthoacetate)