[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a straight-chain alkane with 19 carbon atoms. It has been found as a component of essential oils isolated from Artemisia armeniaca. It has a role as a plant metabolite and a volatile oil component."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C][C]"}]