methyl 3,4-di-O-benzoyl-2-deoxy-2-<(2',2'-dimethoxycarbonylvinyl)amino>-6-O-trityl-α-D-glucopyranoside

aminomethylene-malonic acid dimethyl ester

methyl 3,4-di-O-acetyl-6-S-acetyl-2-deoxy-2-<(2,2-dimethoxycarbonylvinyl)amino>-6-thio-α-D-glycopyranoside