[{"from": "human", "value": "Provide a description of this molecule. [C][C][C][C][=Branch1][C][=O][C][=C][Branch1][S][C@@H1][Branch1][=Branch1][O][C][Ring1][Branch1][=O][C][C][=Branch1][C][=O][O][C][O]"}, {"from": "gpt", "value": "The molecule is the methyl ester of carlosic acid. It is a butenolide, a methyl ester, an enol, a ketone and a tetronic acid derivative. It is functionally related to a carlosic acid."}]