[{"from": "human", "value": "What can you tell me about this molecule? [C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O][C][Branch1][=Branch1][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a monocarboxylic acid anion that is the conjugate base of 13-(octadecanoyloxy)octadecanoic acid, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a 13-(octadecanoyloxy)octadecanoic acid."}]