[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is a polyunsaturated long-chain fatty acid with a 16-carbon backbone and exactly 4 double bonds."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][/C][=C][/C][=C][/C][=C][/C][=C][/C][=Branch1][C][=O][O]"}]