[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][C][C][C][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 resulting from the deprotonation of the carboxy group of henicosanoic acid. Major species at pH 7.3. It is a straight-chain saturated fatty acid anion, a long-chain fatty acid anion and a fatty acid anion 21:0. It is a conjugate base of a henicosanoic acid."}]