[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a polyunsaturated long-chain fatty acid with a 16-carbon backbone and exactly 3 double bonds. There are at least 5 separate isomers that could be called by this name."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][/C][=C][/C][=C][/C][=C][/C][=Branch1][C][=O][O]"}]