[{"from": "human", "value": "Describe this molecule. [C][C][C][=C][C][=C][Branch1][Ring2][S][Ring1][Branch1][C][=Branch1][C][=O][C][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a 4-oxo monocarboxylic acid that is butyric acid bearing oxo and 5-ethyl-2-thienyl groups at position 4. It has a role as a hapten. It is a member of thiophenes and a 4-oxo monocarboxylic acid. It is functionally related to a butyric acid."}]