You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Could you please return a molecule that adheres to this description? It belongs to the tachykinin antagonist class of molecules.
user
CCOCCn1c(NC2CCN(C(=O)OC(C)(C)C)C(Cc3ccccc3)C2)nc2ccccc21
assistant