[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a dicarboxylic acid consisting of fumaric acid having a methyl substituent at the 2-position. It has a role as a human metabolite and a plant metabolite. It is a dicarboxylic acid and a dicarboxylic fatty acid. It is functionally related to a fumaric acid. It is a conjugate acid of a mesaconate(2-)."}, {"from": "gpt", "value": "[C][/C][=Branch1][#Branch1][=C][\\C][=Branch1][C][=O][O][/C][=Branch1][C][=O][O]"}]