You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Give me a molecule that satisfies the conditions outlined in the description: The molecule is a proteasome inhibitor and belongs to the cancer treatment class of molecules.
user
CC(C)CC(NC(=O)C(O)CCc1ccccc1)C(=O)NC(Cc1ccccc1)C(=O)O
assistant