[{"from": "human", "value": "What can you tell me about this molecule? [C].[C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a medium-chain fatty acid anion obtained by deprotonation of the carboxy group of any omega-methyl fatty acid; major species at pH 7.3. It is an omega-methyl fatty acid anion and a medium-chain fatty acid anion."}]