The molecule is a branched amino hexasaccharide consisting of a D-glucosyl residue beta-linked to a 3-aminopropyl group and which carries an N-acetyl-beta-D-glucosaminyl-(1->3)-alpha-D-galactosyl-(1->4)-beta-D-glucosyl unit linked (1->6) and an N-acetyl-alpha-neuraminyl-(2->3)-beta-D-galactosyl unit linked (1->4). Its conjugation to the carrier protein CRM197 elicits an immune response to type III Group B Streptococcus (GBSIII) indicating that it may suffice as a synthetic vaccine antigen. It is an amino hexasaccharide and a glycoside. It derives from a beta-D-GlcpNAc-(1->3)-beta-D-Galp-(1->4)-beta-D-Glcp-(1->6)-[alpha-Neup5Ac-(2->3)-beta-D-Galp-(1->4)]-beta-D-GlcpNAc.
(2S,4S,5R,6R)-5-acetamido-2-[(2S,3R,4S,5S,6R)-2-[(2R,3S,4R,5R,6R)-5-acetamido-2-[[(2R,3R,4R,5S,6R)-5-[(2S,3R,4S,5S,6R)-4-[(2S,3R,4R,5S,6R)-3-acetamido-4,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-3,4-dihydroxy-6-(hydroxymethyl)oxan-2-yl]oxymethyl]-6-(3-aminopropoxy)-4-hydroxyoxan-3-yl]oxy-3,5-dihydroxy-6-(hydroxymethyl)oxan-4-yl]oxy-4-hydroxy-6-[(1R,2R)-1,2,3-trihydroxypropyl]oxane-2-carboxylic acid