[{"from": "human", "value": "Describe this molecule. [C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a long-chain fatty acid anion that is the conjugate base of hexadecanoic acid (palmitic acid); major species at pH 7.3. It has a role as a human metabolite and a Saccharomyces cerevisiae metabolite. It is a long-chain fatty acid anion, a fatty acid anion 16:0, a 2-saturated fatty acid anion and an omega-methyl fatty acid anion. It is a conjugate base of a hexadecanoic acid."}]