methyl (5-tert-butyloxycarbonyl-7,8,9-tri-O-acetyl-5-N,4-O-carbonyl-3,5-dideoxy-D-glycero-α-D-galactonon-2-ulopyranosyl)onate-(2→6)-1,2-3,4-diisopropyl-α-D-galactopyranoside