methyl 2,3,6-tri-O-benzyl-4-O-(benzyl 2-O-methyl-3-O-5-C-methylene-α-L-idopyranosyluronate)-α-D-glucopyranoside

methyl 2,3,6-tri-O-benzyl-4-O-(2,4,6-tri-O-acetyl-3-O-allyl-5-C-vinyl-β-D-glucopyranosyl)-α-D-glucopyranoside