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: The molecule is a pain treatment member of the p2x7 antagonist class.
user
O=C(NCC(c1scnc1C(F)F)N1CCC(OCc2ccc(F)c(F)c2)CC1)c1c(F)cccc1Cl
assistant