[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is an enynal that is nonenal with a double bond at position 2 and triple bonds at positions 4, 6, and 8. It has a role as a metabolite."}, {"from": "gpt", "value": "[C][#C][C][#C][C][#C][/C][=C][/C][=O]"}]