[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a heptadienal in which the two double bonds are located at positions 2 and 4 (the E,E-geoisomer). It has a role as a flavouring agent."}, {"from": "gpt", "value": "[C][C][/C][=C][/C][=C][/C][=O]"}]