[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a hexadecenal containing a double bond at position 2 (the trans-stereoisomer). It is a trans-2,3-unsaturated fatty aldehyde, a n-alk-2-enal and a hexadecenal."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][C][C][C][C][C][C][/C][=C][/C][=O]"}]