[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a dicarboxylic acid dianion obtained by deprotonation of both carboxy groups of oxalic acid. It has a role as a human metabolite and a plant metabolite. It is an oxalate and a dicarboxylic acid dianion. It is a conjugate base of an oxalate(1-)."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][=Branch1][C][=Branch1][C][=O][O-1][O-1]"}]