[{"from": "human", "value": "What can you tell me about this molecule? [C][Branch2][Ring2][N][C@@H1][C@@H1][Branch2][Ring2][=Branch1][C@@H1][Branch2][Ring1][P][C@H1][Branch1][Branch2][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][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][O][O]"}, {"from": "gpt", "value": "The molecule is an alpha-D-galactosyl-(1->2)-D-galactose in which the reducing end anomeric centre has beta-configuration. It has a role as an epitope."}]