[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][=C][C][=Branch1][N][=C][C][=C][Ring1][=Branch1][C][C][=Branch1][C][=O][O-1][N+1][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a monocarboxylic acid anion resulting from the removal of a proton from the carboxy group of (4-nitrophenyl)acetic acid; it is the major species at pH 7.3. It is a conjugate base of a (4-nitrophenyl)acetic acid."}]