[{"from": "human", "value": "Could you provide a description of this molecule? [C][C][C][=C][C][=C][C][=C][C][=C][C][C][C][C][C][C][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is an octadecatetraenoic acid containing a conjugated system of double bonds at positions 9, 11, 13 and 15."}]