[{"from": "human", "value": "What can you tell me about this molecule? [C][=C][C][O][C@@][Branch2][Branch1][Ring2][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@@][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][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a disaccharide derivative consisting of two 3-deoxy-alpha-D-manno-oct-2-ulopyranonosyl units joined via an alpha-(2->4)-linkage with an O-allyl group at the anomeric centre. It has a role as an antigen."}]