[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is a tricarboxylic acid trianion obtained by deprotonation of the carboxy groups of 1,1,1-propanetricarboxylic acid. It is a conjugate base of a 1,1,1-propanetricarboxylic acid."}, {"from": "gpt", "value": "[C][C][C][Branch1][=Branch1][C][=Branch1][C][=O][O-1][Branch1][=Branch1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}]