[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a monocarboxylic acid anion that is the conjugate base of 5-[(9Z)-octadecenoyloxy]octadecanoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a 5-[(9Z)-octadecenoyloxy]octadecanoic acid."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][Branch1][=Branch2][C][C][C][C][=Branch1][C][=O][O-1][O][C][=Branch1][C][=O][C][C][C][C][C][C][C][/C][=C][\\C][C][C][C][C][C][C][C]"}]