ethyl 3,6-di-O-benzyl-2-O-(2-dibromomethyl)benzoyl-4-O-methyl-1-thio-α-D-mannopyranoside

methyl 4-O-acetyl-2-O-methyl-α-L-fucopyranoside

methyl 2-O-methyl-α-L-fucose

o-di-bromomethyl-benzoyl chloride

ethyl 6-O-benzyl-4-O-methyl-1-thio-α-D-mannopyranoside