[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a monocarboxylic acid anion that is the conjugate base of 3-(1H-indol-3-yl)propanoic acid. It has a role as a human metabolite. It is a conjugate base of a 3-(1H-indol-3-yl)propanoic acid."}, {"from": "gpt", "value": "[C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=Branch1][Branch1][=C][N][Ring1][=Branch1][C][C][C][=Branch1][C][=O][O-1]"}]