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 hcv inhibitor, a ns5a inhibitor, a anti viral, and anti viral agent.
user
CNC(=O)C1CCC2CCC(NC(=O)OC)C(=O)N21
assistant