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: It belongs to the p2x7 antagonist class of molecules.
user
CC(C)(C)OC(=O)N1C(=O)C(Cc2ccccc2)CC1(C)C(=O)O
assistant