[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a nona-2,4,6-trienal in which all three double bonds adopt trans-configurations. It has a role as a flavouring agent, an animal metabolite and a pheromone."}, {"from": "gpt", "value": "[C][C][/C][=C][/C][=C][/C][=C][/C][=O]"}]