[{"from": "human", "value": "Describe this molecule. [C][C][=C][C][C][C][Ring1][=Branch1][C][=Branch1][C][=O][O][C][Ring1][=Branch1][=O]"}, {"from": "gpt", "value": "The molecule is a cyclic dicarboxylic anhydride that is 1,3,3a,4,7,7a-hexahydro-2-benzofuran carrying oxo groups at positions 1 and 3. It is a cyclic dicarboxylic anhydride and a tetrahydrofurandione."}]