[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a straight-chain, unsaturated fatty acid anion that is the conjugate base of trans-parinaric acid, arising from deprotonation of the carboxylic acid group. It is a long-chain fatty acid anion, a straight-chain fatty acid anion and a polyunsaturated fatty acid anion. It is a conjugate base of a trans-parinaric acid."}, {"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-1]"}]