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 antagonist.
user
CCC(=O)N1CCN(CCC2(c3ccc(Cl)c(Cl)c3)CCC(=O)N(c3ccccn3)C2)CC1
assistant