[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@H1][C@H1][Branch2][Branch1][#Branch2][C@H1][Branch2][Branch1][Branch1][C@@H1][Branch2][Ring2][S][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@@H1][C@H1][Branch1][#C][C@H1][Branch1][O][C@H1][Branch1][=Branch1][O][C@H1][Ring1][=Branch1][O][C][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][O][O]"}, {"from": "gpt", "value": "The molecule is a branched trisaccharide consisting of beta-D-galactose having an alpha-L-fucosyl residue at the 2-position and an alpha-D-galactosyl residue at the 3-position. It has a role as an epitope."}]