[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@H1][C@@H1][Branch2][Ring2][Branch1][C@H1][Branch1][N][C@H1][Branch1][Branch2][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][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]"}, {"from": "gpt", "value": "The molecule is an alpha-D-Glcp-(1->3)-L-Rhap in which the carbon bearing the anomeric hydroxy group has alpha configuration. It has a role as an epitope."}]