The molecule is an amino tetrasaccharide comprising alpha-D-galactose, beta-D-galactose, N-acetyl-beta-D-glucosamine and (at the reducing end) alpha-D-mannose residues linked sequentially (1->3), (1->3) and (1->2). It is a glucosamine oligosaccharide and an amino tetrasaccharide.
N-[(2S,3R,4R,5S,6R)-4-[(2R,3R,4S,5S,6R)-3,5-dihydroxy-6-(hydroxymethyl)-4-[(2R,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxyoxan-2-yl]oxy-5-hydroxy-6-(hydroxymethyl)-2-[(2S,3S,4S,5S,6R)-2,4,5-trihydroxy-6-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]acetamide