[{"from": "human", "value": "Describe 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 having four double bonds located at positions 5, 9, 12 and 15 (the all-cis-isomer). It has a role as an algal metabolite and a plant metabolite."}]