[{"from": "human", "value": "Generate a molecule based on this description. The molecule is an 18-HEPE(1-) that is the conjugate base of 18(S)-HEPE, arising from deprotonation of the carboxylic acid group; major species at pH 7.3. It is a conjugate base of a 18(S)-HEPE. It is an enantiomer of a 18(R)-HEPE(1-)."}, {"from": "gpt", "value": "[C][C][C@@H1][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]"}]