You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
The molecule has Sour, caramellic, with sweet aftertaste, acrid at high levels. When heated to decomposition it emits acrid smoke and irritating fumes. The molecule has Acrid at high levels. Use the above information to create a molecule.
user
C=CCOC(C)=O
assistant