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 Suffocating odor; when diluted with air there is an odor reminiscent of moldy hay. In the presence of moisture, phosgene decomposes to form hydrochloric acid and carbon monoxide.
user
O=C(Cl)Cl
assistant