[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a monocarboxylic acid anion. It is a conjugate base of a 2-oxindole-3-acetic acid."}, {"from": "gpt", "value": "[C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][Branch1][Branch2][C][=Branch1][C][=O][N][Ring1][#Branch1][C][C][=Branch1][C][=O][O-1]"}]