[3)-beta-D-GlcpA-(1->4)-beta-D-Glcp-(1->]
[3)-beta-d-glcpa-(1->4)-beta-d-glcp-(1->]
A divalent group consisting of β-<small>D</small>-glucuronosyl and β-<small>D</small>-glucosyloxy residues linked (1→4) with attachment points at the glucuronosyl O-3 and glucosyl O-1 atoms. The ST3 repeating unit of <em>Streptococcus pneumoniae</em> serotype 3.