You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: Potentially violent polymerization reaction with bases or acyl chlorides. The molecule has Sharp, pungent. When heated to decomposition, it emits highly toxic fumes of ... nitrogen oxides.
user
Cc1ccc(N=C=O)cc1N=C=O
assistant