methyl 1,2-di-O-acetyl-4-O-allyl-3-O-benzyl-β-L-idopyranosiduronate

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

methyl 2-O-acetyl-4-O-allyl-3-O-benzyl-L-idopyranosiduronate trichloroacetimidate

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

methyl (t-butyldimethylsilyl 3,4-di-O-benzyl-2-O-levulinoyl-β-L-idopyranosid)uronate