[{"from": "human", "value": "Please give me some details about this molecule. [C][O][C@H1][Branch2][Ring1][P][C][O][C@@][Branch2][Ring1][=Branch1][C][C@H1][Branch1][P][C@H1][Branch1][=N][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C@@H1][Branch1][Ring1][C][O][O][O][O][C][=Branch1][C][=O][O][C@@H1][C@@H1][Branch2][Ring1][Ring2][C@@H1][Branch1][S][C][C@@][Branch1][Ring2][O][Ring1][=Branch1][Branch1][=Branch1][C][=Branch1][C][=O][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is a disaccharide derivative consisting of a 3-deoxy-alpha-D-manno-oct-2-ulopyranonosyl residue and a 3-deoxy-7-O-methyl-alpha-D-manno-oct-2-ulopyranonosyl joined via an alpha-(2->8)-linkage. It has a role as an antigen."}]