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 pain treatment member of the p2x3 antagonist class.
user
COC(=O)c1ccc2c(-c3ccccc3Cl)nn(-c3ccc(C)cc3)c2c1
assistant