[{"from": "human", "value": "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][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a polyunsaturated long-chain fatty acid with a 20-carbon backbone and 3 double bonds, originating from the 9th, 12th and 15th positions from the methyl end, with all bonds in the cis- configuration."}]