S. flexneri serotype 1b O-polysaccharide (O factor 9-positive)
s. flexneri serotype 1b o-polysaccharide (o factor 9-positive)
A polysaccharide derivative comprised of a [2)-α-<small>L</small>-Rha<em>p</em><small><sup>III</small></sup>-(1→2)-α-<small>L</small>-Rha<em>p</em><small><sup>II</small></sup>-(1→3)-α-<small>L</small>-Rha<em>p</em><small><sup>I</small></sup>-(1→3)-β-<small>D</small>-Glc<em>p</em>NAc-(1→] tetrasaccharide repeat modified by the (1→4) linkage of an α-<small>D</small>-glucosyl group to the GlcNAc residue and by addition of acetyl groups to O-2 of 80% of the Rha<small><sup>I</small></sup> residues and to either O-3 or O-4 of many of the Rha<small><sup>III</small></sup> residues (70% to O-3; 15% to O-4). The structure provided is representative of that in <em>Shigella flexneri</em> serotype 1b and shows the most common repeating unit.