You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Conceptualize a molecule that meets the specified attribute(s): It belongs to the pain treatment class of molecules.
user
O=C(Cn1c(-c2ccccc2)c(CN2CCC(c3c(F)cccc3Cl)CC2)c2ccccc21)N1CCOCC1
assistant