You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Based on the given information, generate a molecule that meets the desired specifications: When heated to decomposition it emits toxic fumes of chloride. A 500 ml bottle of the acid chloride stabilized with 0.5% of phenothiazine was shipped to a hot climate without refrigeration, and was stored on arrival in a fume cupboard for 2 days at temperatures approaching 50 °c. the material polymerized, bursting the bottle and forming a solid foam.
user
C=CC(=O)Cl
assistant