You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
The molecule is a proteasome inhibitor. Use the above information to create a molecule.
user
CC(C)CC(NC(=O)C(CCc1ccccc1)NC(=O)CN1CCOCC1)C(=O)NC(CO)C(=O)NC(CC(C)C)C(=O)C1(C)CO1
assistant