[{"from": "human", "value": "What can you tell me about this molecule? [C][C][O][C][=Branch1][C][=O][/C][=C][\\C]"}, {"from": "gpt", "value": "The molecule is a but-2-enoate ester obtained by the formal condensation of isocrotonic acid with ethanol. It has a role as a metabolite. It is functionally related to an isocrotonic acid."}]