You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
I need a molecule that meets the following conditions: It belongs to the p2x3 antagonist class of molecules. Please represent the molecule in SMILES.
user
COCCOc1ncccc1C1C(C(=O)C(C)C)=C(O)C(=O)N1c1ccc(-c2csc(C)c2)cc1
assistant