(R)-((3aR,5S,6S,6aR)-6-Benzyloxy-2,2-dimethyl-tetrahydro-furo[2,3-d][1,3]dioxol-5-yl)-trifluoromethanesulfonyloxy-acetic acid methyl ester

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

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