[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is any octadecatrienoic acid with three fully-conjugated double bonds at positions 11, 13 and 15."}, {"from": "gpt", "value": "[C][C][/C][=C][/C][=C][/C][=C][/C][C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}]