[{"from": "human", "value": "Create a molecule with the structure as the one described. 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 addition of acetyl groups to 40% of the O-6 positions of the GlcNAc residue and to either O-3 or O-4 of many of the Rha(III) residues (30% to O-3; 20% to O-4). The structure provided is representative of that in Shigella flexneri serotype Y and shows the most common repeating unit. It has a role as an antigen."}, {"from": "gpt", "value": "[C][C@H1][C@@H1][Branch2][#Branch1][=C][C@H1][Branch2][#Branch1][=Branch2][C@H1][Branch2][Branch1][#Branch2][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@@H1][C@H1][Branch2][Ring2][=N][C@@H1][Branch2][Ring2][Branch2][O][C@H1][Branch1][Branch1][C@@H1][Ring1][=Branch1][O][O][C@@H1][C@H1][Branch2][Ring1][Ring2][C@@H1][Branch1][S][O][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][O][C][O][C][=Branch1][C][=O][C][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]"}]