You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I give you a description of a molecule, and you need to return one molecule in SMILES that meets the description. The description: The molecule is a protease inhibitor.
user
CNCCSc1nnc(C(=O)C(CC(C)C)NC(=O)OCC(C)C)o1
assistant