You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: The molecule is a proteasome inhibitor. Please represent the molecule in SMILES.
user
CC(C)CCC(=O)NC(CC(=O)N1CCCCC1C)C(=O)NC(C)c1ncc(-c2ccc(F)cc2F)[nH]1
assistant