[{"from": "human", "value": "Could you provide a description of this molecule? [C][C@H1][C@H1][Branch2][#Branch1][=Branch1][C@H1][Branch2][=Branch1][P][C@@H1][Branch2][=Branch1][N][C@@H1][Branch1][Ring2][O][Ring1][=Branch1][O][C@@H1][C@H1][Branch2][Branch1][#Branch2][C@@H1][Branch2][Branch1][Branch1][O][C@@H1][Branch2][Ring2][=C][C@H1][Ring1][=Branch1][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][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 tetrasaccharide consisting of N-acetyl-beta-D-glucosamine at the reducing end having an alpha-L-fucosyl residue attached at the 3-position and an alpha-L-fucosyl-(1->2)-beta-D-galactosyl moiety attached at the 4-position. A cancer-associated tetrasaccharide antigen which constitutes the core structure recognised by therapeutic antibody BR96. Conformational restriction around the GlcNAc residue is a key feature of its structure. It has a role as an antigen and an epitope."}]