[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a polyunsaturated long-chain fatty acid with an 18-carbon backbone and exactly 2 double bonds. There are numerous isomers and stereoisomers that can be called by this name."}, {"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]"}]