The molecule is a branched amino pentasaccharide consisting of the linear trisaccharide N-acetyl-alpha-D-galactosaminyl-(1->3)-beta-D-galactosyl-(1->3)-N-acetyl-beta-D-glucosamine having alpha-L-fucosyl residues attached at position 2 of the galactose and position 4 of the glucosamine. Corresponds to a partial structure of blood group A type 1 oligosaccharide. It is an amino pentasaccharide, a galactosamine oligosaccharide and a glucosamine oligosaccharide.
N-[(2R,3R,4R,5R,6R)-2-[(2R,3R,4S,5S,6R)-2-[(2R,3R,4R,5S,6R)-3-acetamido-2-hydroxy-6-(hydroxymethyl)-5-[(2S,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-4-yl]oxy-5-hydroxy-6-(hydroxymethyl)-3-[(2S,3S,4R,5S,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-4-yl]oxy-4,5-dihydroxy-6-(hydroxymethyl)oxan-3-yl]acetamide