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 p2x7 antagonist and belongs to the pain treatment class of molecules.
user
C#Cc1cc(Nc2nc(=O)c(OC)cn2Cc2ccc(F)c(Cl)c2)c(C)cc1F
assistant