[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=O][N][C@@H1][C@H1][Branch2][Branch1][=C][C@@H1][Branch2][Branch1][=Branch2][C@H1][Branch2][Branch1][Ring1][O][C@@H1][Ring1][=Branch1][O][C@H1][C@H1][Branch2][Ring2][#Branch1][O][C@H1][Branch1][=Branch2][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][O][O][O][C@H1][C@H1][Branch2][Ring1][Ring2][C@H1][Branch1][#C][O][C][Branch1][#Branch2][C@@H1][Ring1][=Branch1][N][C][=Branch1][C][=O][C][O][C][O][O][C][O][C][O][O][O]"}, {"from": "gpt", "value": "The molecule is an amino trisaccharide consisting of N-acetyl-alpha-D-glucosamine, beta-D-galactose and N-acetyl-D-galactosamine residues linked sequentially (1->4) and (1->3). It has a role as an epitope. It is a glucosamine oligosaccharide, a galactosamine oligosaccharide and an amino trisaccharide."}]