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 and belongs to the pain treatment class of molecules. Please write the SMILES representation of it.
user
CCCCCC12CCC(C(=O)NNc3ccccc3C)(CC1)CC2
assistant