SMILES: C[C@H]1[C@@H]([C@H]([C@H]([C@@H](O1)O[C@H]2[C@H]([C@@H](O[C@H]([C@@H]2O[C@@H]3[C@@H]([C@H]([C@@H]([C@H](O3)CO)O)O)O)C)O[C@@H]4[C@H]([C@@H](O[C@@H]([C@H]4O)COC(=O)C)O)NC(=O)C)O)O[C@H]5[C@@H]([C@@H]([C@H]([C@@H](O5)C)O)OC(=O)C)O)O)O
Description: The molecule is a polysaccharide derivative comprised of a [2)-alpha-L-Rhap(III)-(1->2)-alpha-L-Rhap(II)-(1->3)-alpha-L-Rhap(I)-(1->3)-beta-D-GlcpNAc-(1->] tetrasaccharide repeat modified by the (1->4) linkage of an alpha-D-glucosyl group to the Rha(I) residue and by addition of acetyl groups to 60% of the O-6 positions of the GlcNAc residue and to either O-3 or O-4 of many of the Rha(III) residues (60% to O-3; 25% to O-4). The structure provided is representative of that in Shigella flexneri serotype 2a and shows the most common repeating unit. It has a role as an antigen.