Structure of the O-polysaccharide from the lipopolysaccharide of Providencia stuartii O43 containing an amide of d-galacturonic acid with l-serine

[3)-β-d-GalpA6(l-Ser)-(1→3)-β-d-GlcpNAc-(1→2)-α-d-Rhap4NAc-(1→4)-β-d-GlcpA-(1→]n