[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C@H1][C@H1][Branch2][=Branch2][C][C@H1][Branch2][Branch2][=N][C@@H1][Branch2][Branch2][Branch2][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@H1][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][Branch2][Ring2][#Branch1][C@H1][Branch2][Ring2][C][C@H1][Branch1][=Branch2][C@H1][Branch1][Ring2][O][Ring1][=Branch1][C][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][N][C][=Branch1][C][=O][C][O][O][O]"}, {"from": "gpt", "value": "The molecule is a branched amino pentasaccharide comprised of a linear chain of beta-D-galactose, N-acetyl-alpha-D-galactosamine, beta-D-galactose and N-acetyl-beta-D-glucosamine residues linked sequentially (1->4), (1->3) and (1->4), with an alpha-L-fucosyl residue linked (1->2) to the galactose residue proximal to the reducing-end N-acetylglucosamine residue. It has a role as an epitope. It is an amino pentasaccharide and a glucosamine oligosaccharide."}]