[{"from": "human", "value": "Please give me some details about this molecule. [C][O][C][=C][C][=Branch1][=Branch2][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C@H1][C@H1][C@@H1][Branch1][Branch1][C][O][Ring1][Branch1][C@@H1][Branch1][=Branch1][O][C][Ring1][#Branch1][=O][C][=C][C][=Branch1][=C][=C][Branch1][=Branch2][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][O][C][O]"}, {"from": "gpt", "value": "The molecule is a lignan that is tetrahydro-1H,3H-furo[3,4-c]furan-1-one substituted by a 3-hydroxy-4,5-dimethoxyphenyl at position 3 and a 3-hydroxy-4,5-dimethoxyphenyl group at position 5. Isolated from the rhizomes of Imperata cylindrica, it exhibits vasodilative activity. It has a role as a metabolite and a vasodilator agent. It is a lignan, a gamma-lactone, a member of methoxybenzenes and a member of phenols."}]