You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Conceptualize a molecule that meets the specified attribute(s): When heated to decomposition, it emits highly toxic fumes of hydrogen chloride.
user
ClC1=C(Cl)C2(Cl)C3C4OC4C(Cl)C3C1(Cl)C2(Cl)Cl
assistant