[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. 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."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][N][=C][C][=C][Ring1][=Branch1][C][C][=Branch1][C][=O][O-1][N+1][=Branch1][C][=O][O-1]"}]