[4)-beta-D-Glcp-(1->4)-[alpha-L-Rhap-(1->2)]-3-O-(2-glycerylphospho)-beta-D-Galp-(1->4)-beta-L-Rhap-(1->]n
[4)-beta-d-glcp-(1->4)-[alpha-l-rhap-(1->2)]-3-o-(2-glycerylphospho)-beta-d-galp-(1->4)-beta-l-rhap-(1->]n
A polysaccharide derivative with a repeating unit consisting of β-<small>D</small>-glucosyl, β-<small>D</small>-galactosyl and β-<small>L</small>-rhamnosyl residues all linked (1→4), to the galactosyl residue of which is attached a glycerol-2-phosphate group via a (<em>P</em>→2) linkage and an α-<small>L</small>-rhamnosyl residue linked (1→2), with all repeating units being linked (1→4). Capsular polysaccharide of <em>Streptococcus pneumoniae</em> serotype 23F.