You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Can you create a molecule that matches the given characteristics? When heated to decomposition it emits acrid smoke and irritating fumes. It belongs to the pharmaceutical class of molecules. The molecule has both a Penetrating fruity odor and a Pear-like flavor.
user
CCCCCC(C)=O
assistant