S. flexneri serotype 1a O-polysaccharide (O factor 9-negative)
s. flexneri serotype 1a o-polysaccharide (o factor 9-negative)
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.