[{"from": "human", "value": "Provide a description of this molecule. [C][C@H1][C@H1][C][=C][Branch2][Ring1][O][C@H1][C@][Ring1][Branch1][Branch1][=Branch1][C][=C][Ring1][Branch2][C][C@@][Branch1][Branch1][C][O][Ring1][Ring1][C][=Branch1][C][=O][O][C][Ring1][N][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a monocarboxylic acid anion that is the conjugate base of pentalenolactone, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a pentalenolactone."}]