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 tachykinin receptor antagonist.
user
CN(C(=O)N(C)C1CN(c2nnc(C3CCN(C(=O)OC(C)(C)C)CC3)o2)CC1c1ccc(F)cc1)c1cc(C(F)(F)F)cc(C(F)(F)F)c1
assistant