[{"from": "human", "value": "Describe 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 exactly 2 double bonds. At least 5 different isomers can be called by this name."}]