[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an unsaturated fatty acid anion that is the conjugate base of (17Z)-hexacosenoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a (17Z)-hexacosenoic 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][C][C][C][C][=Branch1][C][=O][O-1]"}]