[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=O][N][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]"}, {"from": "gpt", "value": "The molecule is an amino disaccharide consisting of N-acetylglucosamine having an N-acetylgalactosaminyl resiude attached at the 4-position via a beta-linkage. It has a role as an epitope."}]