You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: The molecule is a p2x7 antagonist. Please write the SMILES representation of it.
user
O=C(NCC1(O)CCC(F)(F)CC1)c1cn(CC2COC2)c2nccc(Cl)c12
assistant