Abstract The synthesis of the title tetrasaccharide glycoside 38 is reported. p-Nitrophenyl endo-3, 4-O-benzylidene-6-deoxy-α-l-talopyranoside (4, 3-O-acetyl-2, 4-di-O-benzyl-α-l- rhamnopyranosyl trichloroacetimidate (7), methyl 3-O-acetyl-4-O-benzyl-2-O-methyl-1-thio-β- l-fucopyranoside (15) 3-O-acetyl-4-O-benzyl-2-O-methyl-α-l-fucopyranosyl bromide (16), and ethyl 3-O-acetyl-4-O-benzyl-2-O-methyl-1-thio-α-d-rhamnopyranoside (33) were ...