[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a straight chain alkane composed of 20 carbon atoms. It has been isolated from the leaves of Agave attenuata. It has a role as a plant metabolite."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C]"}]