[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][Branch2][Ring2][C][C][C@H1][C][=C][Branch2][Ring1][=Branch1][C@H1][C@][Ring1][Branch1][Branch1][Ring2][C][Ring1][Branch2][C][=Branch1][C][=C][C][=Branch1][C][=O][O][C][Ring1][=Branch2][C][=Branch1][C][=O][O][C]"}, {"from": "gpt", "value": "The molecule is a sesquiterpene lactone obtained by formal dehydrogenation of the 4-methyl position of pentalenolactone D. It has a role as a bacterial metabolite. It is a sesquiterpene lactone, an organic heterotricyclic compound and an alpha,beta-unsaturated monocarboxylic acid. It is a conjugate acid of a pentalenolactone E(1-)."}]