[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a dicarboxylic acid monoanion that is the conjugate base of oxalic acid. It has a role as a human metabolite and a plant metabolite. It is a dicarboxylic acid monoanion and an oxalate. It is a conjugate base of an oxalic acid. It is a conjugate acid of an oxalate(2-)."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O]"}]