S. flexneri serotype 3a O-specific polysaccharide
s. flexneri serotype 3a o-specific polysaccharide
A polysaccharide derivative antigen composed of a backbone of repeating α-<small>D</small>-Glc-(1→3)-α-<small>L</small>-Rha-(1→2)-α-<small>L</small>-Rha-(1→3)-2-<em>O</em>-Ac-α-<small>L</small>-Rha-(1→3)-β-<small>D</small>-GlcNAc units that are connected via β-(1→2)-linkages between the GlcNAc and the Rha residue adjacent to Glc.