[3)-beta-D-GlcpNAc-(1->4)-alpha-L-Rhap-(1->]n
[3)-beta-d-glcpnac-(1->4)-alpha-l-rhap-(1->]n
A polysaccharide derivative composed of a backbone of β-<small>D</small>-GlcNAc-(1→4)-<small>L</small>-Rha repeating units that are joined to each other via α-(1→3)-linkages; corresponds to the repeating unit of the O-polysaccharide from <em>Pasteurella haemolytica</em> serotypes 3 and 15.