[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@H1][C@H1][Branch2][#Branch1][=Branch1][C@H1][Branch2][=Branch1][P][C@@H1][Branch2][=Branch1][N][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@@H1][C@H1][Branch2][Branch1][=C][O][C][Branch2][Branch1][Branch2][C@@H1][Branch2][Ring2][=C][C@H1][Ring1][=Branch1][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][C@H1][C@H1][Branch1][S][C@@H1][Branch1][N][C@@H1][Branch1][Branch2][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][C][O][O][O][N][C][=Branch1][C][=O][C][O][C][O][O][O][O]"}, {"from": "gpt", "value": "The molecule is an amino tetrasaccharide consisting of N-acetylglucosamine having a fucosyl residue attached at the 4-position via a beta-linkage and alpha-fucosyl-(1->2)-galactosyl residues attached at the 3-position, also via a beta-linkage. It has a role as an epitope and an antigen. It is an amino tetrasaccharide and a glucosamine oligosaccharide."}]