[{"from": "human", "value": "Provide a description of this molecule. [C][C][=Branch1][C][=O][N][C@@H1][C@H1][Branch2][Branch1][=N][C@H1][Branch2][Branch1][Branch2][C@H1][Branch2][Branch1][C][O][C@H1][Ring1][=Branch1][O][C@@H1][C@H1][Branch2][Ring2][=Branch1][O][C@H1][Branch1][=C][C@@H1][Branch1][Branch1][C@H1][Ring1][=Branch1][O][N][C][=Branch1][C][=O][C][O][C@H1][C@H1][Branch1][#C][C@H1][Branch1][#Branch2][O][C@@H1][Branch1][Branch1][C@@H1][Ring1][=Branch1][O][O][C][O][O][C][O][C][O][O][O]"}, {"from": "gpt", "value": "The molecule is a linear amino trisaccharide comprising alpha-D-galactose at the reducing end having a N-acetyl-beta-D-galactosaminyl-(1->4)-N-acetyl-beta-D-glucosaminyl moiety attached at the 3-position. It has a role as an epitope."}]