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