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 tachykinin receptor antagonist.
user
COC1(C)CCC(=O)N2CC(OC(C)c3cc(C(F)(F)F)cc(C(F)(F)F)c3)C(c3ccc(F)cc3)C21
assistant