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 p2x3 antagonist class of molecules.
user
Cc1ccc(-c2cc(C(=O)NCc3cnc(C(F)(F)F)cn3)cc(-n3nnnc3C(C)C)c2)nc1
assistant