[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a monocarboxylic acid anion that is the conjugate base of 3-(3-hydroxyphenyl)propanoic acid. It has a role as a human xenobiotic metabolite. It is a conjugate base of a 3-(3-hydroxyphenyl)propanoic acid."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][=Branch2][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][C][C][=Branch1][C][=O][O-1]"}]