[{"from": "human", "value": "Describe 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][Ring2][#Branch2][C@H1][Branch2][Ring2][Branch1][C@H1][Branch2][Ring1][#C][O][C@H1][Ring1][=Branch1][O][C@@H1][C@H1][Branch2][Ring1][Ring1][O][C][Branch1][=C][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][O][N][C][=Branch1][C][=O][C][O][C][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 amino tetrasaccharide with a structure consisting of an alpha-galactosyl-(1->3)-beta-galactosyl-(1->4)-N-acetylglucosamine backbone, to the subterminal galactose of which is alpha(1->2)-linked a fucosyl residue. It has a role as an epitope. It is an amino tetrasaccharide and a glucosamine oligosaccharide."}]