[{"from": "human", "value": "Describe this molecule. [C][C][Branch1][#Branch2][C][=Branch1][C][=C][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a dicarboxylic acid that is succinic acid substituted by a methylene group at position 2 and a methyl group at position 3. It is a dicarboxylic acid and an olefinic compound. It is functionally related to a succinic acid. It is a conjugate acid of a 2-methylene-3-methylsuccinate(2-)."}]