[{"from": "human", "value": "Provide a brief overview of this molecule. [C][O][C][=C][Branch2][Ring2][Branch1][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][C@H1][C][O][C][Branch2][Ring1][Ring2][C@@H1][Ring1][Branch1][C][C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][O][C][O][Ring1][#Branch1][O][O][C]"}, {"from": "gpt", "value": "The molecule is a lignan that consists of tetrahydrofuran-2-ol substituted by a 1,3-benzodioxol-5-ylmethyl group at positions 3 and a 3,4-dimethoxybenzyl group at position 4 (the 3R,4R stereoisomer). It is isolated from the leaves of Piper nigrum and exhibits histamine release inhibitory activity. It has a role as a histamine antagonist and a plant metabolite. It is a member of benzodioxoles, a cyclic acetal, a lactol, a lignan and a secondary alcohol."}]