[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a hexadecenoic acid having a trans-double bond at the 3-position. 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][=Branch1][C][=O][O]"}]