[{"from": "human", "value": "Describe this molecule. [C][C][C][C][C][/C][=C][\\C][/C][=C][\\C][/C][=C][\\C][C][C][C][C][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "A 20-carbon-chain fatty acid, unsaturated at positions 8, 11, and 14. It differs from arachidonic acid, 5,8,11,14-eicosatetraenoic acid, only at position 5."}]