The molecule is a branched amino tetrasaccharide consisting of a sialyl residue, linked (2->3) to a galactosyl residue that in turn is linked (1->3) to a glucosaminyl residue, which is also carrying a fucosyl residue at the 4-position. It is a glucosamine oligosaccharide and an amino tetrasaccharide.
(2S,4S,5R,6R)-5-acetamido-2-[(2R,3R,4S,5S,6R)-2-[(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-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid