You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Give me a molecule that satisfies the conditions outlined in the description: The molecule is a p2x3 antagonist and belongs to the pain treatment class of molecules.
user
CNc1cc(Oc2cnc(N)nc2N)c(C(C)C)c(OC)n1
assistant