You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Suppose there is a molecule that meets the following description: It belongs to the p2x3 antagonist class of molecules. Please write the SMILES representation of it.
user
COCCOc1ccc(C2C(C(=O)C(C)C)=C(O)C(=O)N2c2ccc(-c3ccsc3)cc2)cc1
assistant