[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is an alpha,beta-unsaturated monocarboxylic acid that is acrylic acid in which the hydrogen at position 2 is substituted by a methyl group. It is functionally related to an acrylic acid. It is a conjugate acid of a methacrylate."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=C][C][=Branch1][C][=O][O]"}]