[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a polyunsaturated long-chain fatty acid with an 18-carbon backbone and exactly three double bonds, originating from the 5th, 7th and 9th positions from the methyl end, with these three bonds in the cis-, trans- and cis- configurations, respectively."}, {"from": "gpt", "value": "[C][C][C][C][/C][=C][\\C][=C][\\C][=C][/C][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}]