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 dppiv inhibitor.
user
CN(C)C(=O)COC1C(CN2CCC(C)(N)CC2)OC2OC(C)(C)OC21
assistant