[{"from": "human", "value": "What can you tell me about this molecule? [C][C][=Branch1][C][=C][C@@H1][C@@H1][C@@H1][C@@][Branch2][Ring2][Ring1][C@][Branch1][O][C@H1][Ring1][=Branch1][C][=Branch1][C][=O][O][Ring1][Branch2][Branch2][Ring1][C][C][C@@H1][C@][Ring1][=Branch2][Branch1][Ring2][O][Ring1][Ring1][C][=Branch1][C][=O][O][Ring1][=C][O][C]"}, {"from": "gpt", "value": "The molecule is a picrotoxane sesquiterpenoid that is 3a,4,5,6,7,7a-hexahydro-1H-indene-3,7-dicarboxylic acid which is substituted at positions 3a, 6, and 7a by methyl, isopropenyl, and hydroxy groups, respectively; in which the double bond at position 2-3 has been epoxidised; and in which the carboxy groups at positions 3 and 7 have undergone gamma-lactone formation by O-alkylation to positions 4 and 5, respectively. A component of picrotoxin. It has a role as a plant metabolite, a GABA antagonist and a serotonergic antagonist. It is an organic heteropentacyclic compound, an epoxide, a tertiary alcohol, a gamma-lactone and a picrotoxane sesquiterpenoid."}]