[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a dicarboxylic acid."}, {"from": "gpt", "value": "[C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O-1][\\C][=Branch1][C][=O][O-1].[Fe+2]"}]