methyl 3-O-benzyl-4-O-levulinoyl-1,2-O-[(1-pent-4-enyloxy)benzylidene]-β-L-idopyranuronate

4-[(phenylcarboxy)methyl]benzyl N-benzyl-N-[5-(methyl ((2-O-benzoyl-3-O-benzyl-4-O-levulinoyl-α-L-idopyranosyl)oxy)uronate)pentyl]carbamate