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: The molecule is a proteasome inhibitor.
user
CC(C)(C)OC(=O)NC(COC(F)F)C(=O)NC(COC(F)F)C(=O)NC(Cc1ccccc1)C(=O)C1(C)CO1
assistant