methyl 2-O-pivaloyl-3-O-benzyl-4-O-levulinoyl-L-idopyranosiduronate trichloroacetimidate

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

methyl (2,4-di-O-acetyl-3-O-benzyl-α-L-idopyranosyl bromide)uronate

methyl 3-O-benzyl-1,2-O-isopropylidene-α-L-idofuranosiduronate

methyl 3,4-di-O-benzyl-1,2-O-isopropylidene-α-L-idopyranosiduronate