methyl <2-(4-trifluoroacetamidophenyl)ethyl 4-O-benzyl-3-deoxy-7,8-O-isopropylidene-5-O-(3,4,6-tri-O-acetyl-2-O-benzyl-α-D-glucopyranosyl)-α-D-manno-oct-2-ulopyranosid>onate