You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
It belongs to the tachykinin antagonist class of molecules. Use the above information to create a molecule.
user
COC(=O)C(N)C(C(=O)C(N)Cc1ccccc1)(C(=O)C(N)Cc1ccccc1)C(C)C
assistant