[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a long-chain polyunsaturated fatty acid anion that is the conjugate base of (13Z,16Z,19Z)-docosatrienoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a long-chain fatty acid anion, a polyunsaturated fatty acid anion and a docosatrienoate. It is a conjugate base of a (13Z,16Z,19Z)-docosatrienoic acid."}, {"from": "gpt", "value": "[C][C][/C][=C][\\C][/C][=C][\\C][/C][=C][\\C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O-1]"}]