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): The molecule is a p2x7 antagonist and belongs to the pain treatment class of molecules.
user
Cc1c(Cl)cccc1Nc1nc(=O)c(CN)cn1Cc1ccccc1
assistant