[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is the straight-chain keto form of D-tagatose. It is an enantiomer of a keto-L-tagatose."}, {"from": "gpt", "value": "[C][Branch2][Ring1][Ring1][C@H1][Branch1][#C][C@@H1][Branch1][O][C@@H1][Branch1][#Branch1][C][=Branch1][C][=O][C][O][O][O][O][O]"}]