[{"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 pivalic acid. It is a conjugate base of a pivalic acid."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][Branch1][C][C][C][=Branch1][C][=O][O-1]"}]