You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: The molecule is a dppiv inhibitor.
user
COC(=O)c1cnc(N2CC(NC(=O)OC(C)(C)C)C(c3cc(F)ccc3F)C2)cn1
assistant