[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is an organic radical anion obtained from carbon dioxide. It is a metabolite of carbon tetrachloride. It has a role as a xenobiotic metabolite. It is a carbon oxide and an organic radical anion."}, {"from": "gpt", "value": "[CH0][=Branch1][C][=O][O-1]"}]