Synthesis of p-Trifluoroacetamidophenyl (4,6-dideoxy-4-formamido-3-C-methyl-2-O-methyl-α-L-mannopyranosyl) -(1→3)-(2-O-methyl-α-D-rhamnopyranosyl)-(1→3)- (2-O-methyl-α-L-fuco# pyranosyl)-(1→3)-(α-L-rhamnopyranosyl)- (1→2)-6-deoxy-α-L-