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
O=c1nc(N2CCC(O)(c3ccc(F)cc3)CC2)ncn1Cc1ccc(C(F)(F)F)s1
assistant