[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][C][Branch2][Ring1][=Branch1][/C][=C][/C][=C][\\C][/C][=C][\\C][/C][=C][\\C][/C][=C][\\C][C][C][C][=Branch1][C][=O][O-1][O]"}, {"from": "gpt", "value": "The molecule is an icosanoid anion that is the conjugate base of 18-HEPE, arising from deprotonation of the carboxylic acid group; major species at pH 7.3. It has a role as a human xenobiotic metabolite. It is a hydroxy fatty acid anion, a polyunsaturated fatty acid anion, a long-chain fatty acid anion and an icosanoid anion. It is a conjugate base of a 18-HEPE."}]