[{"from": "human", "value": "Describe this molecule. [C][C@H1][C@H1][Branch2][Branch2][P][C@H1][Branch2][Branch2][N][C@@H1][Branch2][Branch2][#Branch1][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@@H1][C@H1][Branch2][#Branch1][Branch1][C@@H1][Branch2][=Branch1][S][O][C@@H1][Branch2][=Branch1][=Branch2][C@H1][Ring1][=Branch1][O][C@H1][C@@H1][Branch2][Ring2][O][C@H1][Branch1][=N][C@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][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][N][C][=Branch1][C][=O][C][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][C][O][O][N][C][=Branch1][C][=O][C][O][O][O]"}, {"from": "gpt", "value": "The molecule is a branched amino pentasaccharide consisting of the linear trisaccharide N-acetyl-alpha-D-galactosaminyl-(1->3)-beta-D-galactosyl-(1->4)-N-acetyl-beta-D-glucosamine having alpha-L-fucosyl residues attached at position 2 of the galactose and position 3 of the glucosamine. Corresponds to a partial structure of blood group A type 2 oligosaccharide. It has a role as an epitope. It is an amino pentasaccharide, a galactosamine oligosaccharide and a glucosamine oligosaccharide."}]