The molecule is a branched tetrasaccharide consisting of an alpha-L-Rha-(1->3)-alpha-L-Rha-(1->3)-beta-D-GlcNAc trisaccharide chain, to the central rhamnose residue is also linked alpha(1->4) a D-glucose residue. Derived from the Shigella liposaccharide O-antigen, it has antigenic properties. It has a role as an antigen.
N-[(2R,3R,4R,5S,6R)-2,5-dihydroxy-6-(hydroxymethyl)-4-[(2S,3R,4S,5S,6S)-3-hydroxy-6-methyl-5-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]oxy-4-[(2S,3R,4R,5R,6S)-3,4,5-trihydroxy-6-methyloxan-2-yl]oxyoxan-2-yl]oxyoxan-3-yl]acetamide