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: It belongs to the tachykinin antagonist class of molecules.
user
CCOCCn1c(NC2CCN(C3CCN(C(=O)C4(C(F)(F)F)C=CC=C(C(F)(F)F)C4)C(Cc4ccccc4)C3)CC2)nc2ccccc21
assistant