You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Generate a molecule based on this description: When heated to decomposition ... emits very toxic fumes of hydrogen chloride and nitrogen oxides.
user
Cl.N=C1C=CC(=C(c2ccc(N)cc2)c2ccc(N)cc2)C=C1
assistant