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: It belongs to the pain treatment class of molecules.
user
Cc1cc(C(F)(F)F)cc(N2CC(NC(=O)Nc3ccccc3Br)C2)n1
assistant