[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. 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->3) linkage of an alpha-D-glucosyl group to the Rha(II) residue and by addition of an acetyl group to either O-3 or O-4 of many of the Rha(III) residues (35% to O-3; 25% to O-4). The structure provided is representative of that in Shigella flexneri serotype 5a and shows the most common repeating unit. It has a role as an antigen."}, {"from": "gpt", "value": "[C][C@H1][C@@H1][Branch2][Branch2][=C][C@H1][Branch2][Ring2][Branch1][C@H1][Branch2][Ring1][S][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@@H1][C@H1][Branch1][#C][C@@H1][Branch1][O][O][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][O][C][O][O][N][C][=Branch1][C][=O][C][O][O][C@H1][C@@H1][Branch2][Ring2][Branch1][C@@H1][Branch1][N][C@H1][Branch1][Branch2][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][C@@H1][C@@H1][Branch1][P][C@H1][Branch1][=N][C@@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][O][O][O][C@H1][C@@H1][Branch2][Ring1][Branch1][C@@H1][Branch1][N][C@H1][Branch1][Branch2][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][C][=Branch1][C][=O][C][O][O]"}]