[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule is an enal that is pentalen-13-ol in which the primary hydroxy group hax been oxidised to the corresponding aldehyde. It is an enal and a sesquiterpenoid. It is functionally related to a pentalenene."}, {"from": "gpt", "value": "[C][C@@H1][C][C][C@@H1][C@][Ring1][Branch1][C][C][Branch1][O][C][C@H1][Ring1][Branch1][C][=C][Ring1][Branch2][C][=O][Branch1][C][C][C]"}]