[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an N,N'-diacetylchitobiose having beta-configuration at the reducing end anomeric centre. It has a role as an epitope. It is functionally related to a beta-D-glucosaminyl-(1->4)-beta-D-glucosamine."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][N][C@@H1][C@H1][Branch2][Ring2][=Branch2][C@@H1][Branch1][O][C@H1][Branch1][=Branch1][O][C@H1][Ring1][=Branch1][O][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][N][C][=Branch1][C][=O][C][O]"}]