[{"from": "human", "value": "Generate a molecule based on the given 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 GlcNAc residue and by addition of acetyl groups to O-2 of 80% of the Rha(I) residues and to either O-3 or O-4 of many of the Rha(III) residues (70% to O-3; 15% to O-4). The structure provided is representative of that in Shigella flexneri serotype 1b and shows the most common repeating unit. It has a role as an antigen."}, {"from": "gpt", "value": "[C][C@H1][C@@H1][Branch2][=Branch2][Branch1][C@H1][Branch2][Branch2][S][C@H1][Branch2][=Branch1][P][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@@H1][C@H1][Branch2][=Branch1][Ring2][C@@H1][Branch2][Branch1][#C][O][C@H1][Branch1][#Branch2][C@@H1][Ring1][=Branch1][O][C][=Branch1][C][=O][C][O][C@@H1][C@H1][Branch2][Ring2][=Branch1][C@@H1][Branch2][Ring1][P][O][C@@H1][Branch2][Ring1][#Branch2][C@H1][Ring1][=Branch1][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][C][O][O][N][C][=Branch1][C][=O][C][C][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][O]"}]