You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule has Odorless. When heated to decomposition it emits acrid smoke and fumes.
user
O=C(O)C1C2CCC(O2)C1C(=O)O
assistant