You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: It belongs to the pain treatment class of molecules. Please represent the molecule in SMILES.
user
CCS(=O)(=O)NC(=O)c1cc(C)c(CN2CCN(c3ccc(Cl)c(Cl)c3)CC2)cc1F
assistant