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.
user
O=C(NC(Cc1ccccc1)C(=O)NC(Cc1c[nH]c2ccccc12)C(=O)O)c1cnccn1
assistant