[{"from": "human", "value": "Describe this molecule. [C][C][=C][Branch1][=Branch1][O][C][Ring1][Branch1][=O][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is the 4,5-dihydro- derivative of 5-oxo-2-furylacetic acid. It has a role as a bacterial metabolite. It is a conjugate acid of a 5-oxo-4,5-dihydro-2-furylacetate."}]