2,6-anhydro-4,5,7,8-tetra-O-benzyl-3-deoxy-2-C-(hydroxymethyl)-D-glycero-D-talo-octonic acid lactone

methyl (3aS,4R,7aR)-4-[(4R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2,2-dimethyl-3a,7a-dihydro-4H-[1,3]dioxolo[4,5-c]pyran-6-carboxylate